AITA my girlfriend says I make her feel ugly, but I have no idea what else she wants me to do.

So like super awkward for me to be here with my dirty laundry, but I need some open opinions. My gf has really bad depression, so when she smiles its a huge thing and I always tell her that she's super pretty when she smiles. Everytime she does it I remind her how beautiful she is. Apparently its been giving the opposite affect and she says that she feels like she's only pretty when she smiles but thats not it at all. I tried to explain to her that shes always gorgeous, and I wanted her to be happier so I wanted to give positive reassurance to make her feel better, and it wasnt the smile I found pretty but her happiness. She said my logic was ridiculous and now she won't text me back. I feel like I did everything right. Am I missing something? We're both in our early 20s.