Prepared to be told I'm being a bit harsh as my opinion may be clouded by past minor issues with MIL.
We used to live around the corner from MIL and did until DD was one. She used to want to see her all the time and popped in fairly regularly which was all good. We then moved about 45 minutes away and despite MIL saying she would visit etc it's become vanishingly rare. MIL has a car and no mobility issues. We would visit her but MIL has discouraged this as she doesn't have any space no when we did go to see her last time she didn't even invite us in we all just sat in a local coffee shop then went home again.
So far this year MIL has gone to visit once for the afternoon. She has an open invitation which I have reminded her of many times when she texts to ask how DD is or we speak on the phone (maybe once a week). If I try to pin her down to a day for a visit she will say "that will be lovely" but won't commit and it doesn't happen.
MIL is busy, she has a very active social life plus some caring responsibilities so I know she has quite a lot going on, but DD is starting to notice and to be honest she goes further than we are for her hair appointments. AIBU to be annoyed she seems to have very little interest in her only grandchild, especially when she talks as if DD is her whole world!