Absolutely what Bonita says. Viet has become a sort of "pay attention" thing for her. The intonations of both languages are very very different.
But they DO learn words ... and how you say them makes a huge difference.
The other big difference is that you're female and your dad is male ... and men speak in lower tones. So from the start she's likely going to listen to him because it's a more 'growly' sound to her.
So YOU need to practice speaking in lower tones to her -- we women have to learn to moderate our tone, some of us more than others, in order to be taken seriously. Simply take the word "no" or a completely innocuous word like "fence" -- and say it as if you're mad, sad, disappointed, happy, delighted, etc. Then say it in all the same 'emotions' but say it **quieter**.
But words are simply commands to them -- they don't think in 'words' they think in pictures for the most part -- but they DO understand a huge range of human words. Particularly if they are **taught** a wide vocabulary, this is true.
If I say to mine "Billy, Luna, Kee and Mom and Dad are all going beddytimes away" you will get a completely different reaction than if you say "Mom and Dad are going beddytimes away". If they know THEY are going "with" -- trust me -- they are gonna go nuts! To my crew "beddytimes away" means a MOTEL. And that, to mine, is the highest form of entertainment on the planet!!!
BUT ... if it's just David and I? Luna will go nuts -- because to her that means SHE gets to go to Miss Emilys Bed & Biscuit -- which is her second favorite place on the planet!! However, to Billy it means *NOT* with Mom and that is the worst thing ever for him. So there is a completely individual understanding there.
You might want to have a word that simply means "quit doing whatever you're doing" ... like just use the word "Quit" ("stop" you may want to reserve as in relation to 'halt' or don't go any further). But every time she does a behavior (like jumping up to be fed) you simply firmly but gently put her on the floor and say "Quit".
You have to mean it EVERY time you say it tho -- if you come to a point where you no longer want to repeat yourself or if you've done it twice and it's simply become a game, then DO put her in her crate or somewhere secure. Because to allow her to continue makes your training worthless. You have to follow thru on your command every single time.
I don't crate mine while we eat. But I DO make them follow a spatial distance. Having a target -- like a soft rug that is hers alone -- works well if you use it repeatedly. Put her in a 'sit' on her rug and tell her to stay there. Gradually (as time passes) move that target further away from where you are eating but be consistent that she has to stay ON her rug til you release her.
At one time I had a dog who was deaf. He had been hearing, but because of really horrible ear infections from before we had him (added to some really bad vet care) we had to have his ears removed in a procedure called a bi-lateral ear ablation. Two separate surgeries almost a year apart. But when done, he was completely 'stone deaf'.
However, all during this time I worked with him on sign language. Muffin didn't just know a few basic signs. He knew and responded to about 60 -70 signs.
He didn't just want to know we were going to the "vet" (same as the American Sign Language sign for 'doctor' except with a "V" rather than a "D";). oh noooooooooooooooo! Muffin wanted to know WHICH vet! So we had a separate sign for Dr. Bailey (regular vet), Dr. DiNatale (holistic vet), Dr. Randall (his U of Fl oncology vet), etc. so I had to do Dr.+B and Dr.+D and Dr.+R ...
He knew the difference between "food" (as in me putting down their food) and "Supper" (as in David and I going out to eat). But he KNEW they were both ***FOOD*** but he understood the one meant and coupled with Mom + Dad + go that David and I were going OUT of the house and then he might have a white 'to go' box in his future.
It was really pretty funny -- because with his knowledge of sign he often knew MORE than the other dogs, because he 'got' the subtle differences (like David and I eating ... but not *here*).
My point is, they learn whatever you take the time to teach them. Break your commands in English down into smaller single words --- rather than saying "you can't eat this" just tell her "no" or "quit" -- she's going to get the idea that she can't have any if you don't GIVE her any, but the immediate behavior you want to change is having her "sit" politely on the floor.
Mine may sit 6' away, but that doesn't quell the hope in the doggie heart that they'll 'get' something for good behavior. But they KNOW that getting up on Mom's knee will only get them banished. It doesn't work!