It's really too much. If you love her, you should respect her choice. Whether it is right or wrong, even if it is wrong, you should let her try, otherwise she will never feel wrong. Moreover, if she really gave up her present major because of your intervention, then if one day she regrets it, the first person she hates is you, which may become the topic of your quarrel in the future.

Besides, your worry is unnecessary. If a person really wants to learn, no matter what industry he is engaged in, he may not learn well. If you don't trust her, it only shows that you have no confidence in your love. In other words, if you don't have confidence, men should have confidence. Moreover, if she enters this industry, the relationship between you will also be tested. Actually, this is a good thing or a bad thing!

To sum up: If you love her, please respect her.