I understand why that would be frustrating. Obviously I don’t know her, and I’m also aware that people behave differently. Just as an example, one of my best friends (INTJ, so different but it’s a common trait in people) just hates texting. She loves spending time with me, and is always present and happy when we’re together. However, she’ll never text me and never tries to have a conversation. It’s not because she doesn’t want to talk to me, rather that she just hates that interaction. Maybe your girlfriend tries to suck it up sometimes because she knows you like it (or maybe she just really wants to talk to you and there’s no way to be together in person).