My girlfriend doesn't think I talk enough

So, I've been with my girlfriend for roughly four years and probably within the last few months an issue has come up. She gets really upset that I'm not very talkative. I do tend to reply a lot with 'yeah' 'mhm' and in general I keep my replies short. I work in a call center and have for years, so I talk nearly all day to strangers for customer service issues. She and I also text pretty much all our waking hours, do phone calls on breaks and stuff.

We are a little long distant, we live about two hours from each other but usually visit each other for a whole week each month. This is when she gets bothered that I don't always want to talk. To me, it seems she wants to talk the entire time we're together which I don't mind but sometimes talking tires me out a lot. I've brought this up to her, that especially after work I don't always want to talk but I'll always listen and love to hear her voice but she doesn't want to "talk to a brick wall" which I understand.

We want to move in together, but the idea that I may have to live with having to always talk constantly, every second is giving me a ton of anixety. I've asked before that I needed quiet time, time to spend just with myself without any communication which is usually sitting in my room to read or something. At first she was okay with this but the last few times I've done it she comes into my room crying to say I don't love her anymore.
It's usually only about 15-30 mins a day, the rest is spent with her.
I don't know what to do at this point, I do love her but I struggle so much keeping up conversations with her and I don't want to be hurting her by not engaging.