Hello! English is not my native language, I apologize for any mistakes. 
I stayed in touch with 4 girls from my friend group in high school (we're 23 now). We'll call the friend in question Amy.

The problem between us started when we would meet (the 4 of us) and I noticed she would take very minimal part of the conversation. She is very easily distracted, and usually about 50% of the time we hang out she will be on her phone chatting to other friends, or she falls asleep and asks to wake her when we're leaving, which we gave her shit about constantly but she would see it as a joke and part of her personality and wouldn't really stop. 

I think it's rude and after a while I kind of stopped putting effort in keeping in touch, and she in turn didn't do much on her side. 
The 2 other girls from the original group and I all live nearby so I see them quite often, though rarely as a group. 
Only 1 friend remained in semi-regular contact with her (Kate). 

Amy is going on a trip that will possibly last a few months and she sent a text in our group chat that if we want to see her before this we should do something about it. 
I thought it was bizarre that she sent that text in a chat that's been dead for the last year, and couldn't meet her in the time frame anyway so I didn't respond. 

Kate met with her yesterday and she mentioned that Amy was hurt that me and the other friend didn't reach out. I felt quite bad about it honestly, but after I thought about it a little I'm not so sure she's in the right. 

I think that it's weird that she got offended with how distant we've obviously become, but maybe she felt that we were still close? AITA? 
