I'm not sure if I'm being unreasonable or a terrible daughter but I don't think I am!!!
My whole childhood was always just me and DM, no siblings and no father around. I became a young mum, so I probably moved out and started my only life earlier than she anticipated.
I run my own home, have a toddler, have a DP, work and study. We have a fairly busy life and we are very structured with it.
I believe I still spend a reasonable amount of time with DM. I message her pretty much all day sometimes. Speak on the phone about 4 times a week (15 minute ish calls). I probably see her about twice a week (maybe 3 hours in total?). It isn't a lot in comparison to what we used to be like but she can't expect it to stay the same, can she? 
Anyway, over the past couple of months she's started making digs about how I never make an effort, always too busy with my own life, about how she used to call her mum every single night after I've gone to bed. She was even laughing about how she was bitching with an old friend about me never making an effort with her. She makes comments to my DS about how 'mummy needs to bring you to mine more too!' when she's visiting us- (I usually bring him every 2-3 weekends, I and she work all weekdays and she usually stops by here on the weekends in between!). She keeps making comments about how I don't care about our relationship anymore and make no effort to keep the strength of it going, and comments like, 'oh, I probably haven't told you yet, I never get to speak to you properly anymore!'
AIBU for this to start really annoying me now?