Then I'd have a conversation with her to really explain how your lives have changed, and that you still care about her and want to see her, but it's much more difficult to do some activities now. Offer some activity on your terms (e.g. come over for coffee while the baby naps), when you turn her down for something she invites you to.
Unfortunately that conversion has been had.
Several times in fact, beginning when I was pregnant and we had another variation of it this Xmas.
We've both invited her to do things as well and have been shot down. She does not seem keen to do things unless their are her plans on her agenda.
Mr Cellardoor and I have come to the conclusion this is the end of line for this particular friendship.
Oh well. Such is life.