To ditch this mum friend?

[Travelfairy]

Invited to meet me and DD with her amd her DD at the park, there's a coffee dock nearby. Got coffee and then went to park. Immediately she saw a friend of hers left me, was talking to friend for 20 mins, came back for 5 then went back over to her for another 20 mins. Didn't seem to think this was rude behaviour. AIBU to ease off contact?
It didn't really suit me to even meet but I moved a couple of things around, she literally just ditched me 🤷‍♀️

Well, that’s on you. If the timing didn’t suit me, I’d have said ‘Another time.’ Kids adjust to the fact that sometimes adult stuff has to come first, and the play date has to be next week.

Plus you describe her as a ‘mum friend’, but you say in your update that despite voluntarily spending time with her, you don’t like her much and she’s not that nice to you. Her behaviour at the park seems entirely in line with her usual behaviour to you. Which you appear to uncomplainingly put up with.

It’s that usual, mystifying Mn thing — I have a ‘friend” I don’t like who is not very nice to me, yet I go to some trouble to see them, and I’m annoyed enough to post about some new instance of this same behaviour.

Why couldn't the friend have come and say with you?
Talk to her. Most of the time things can be solved by talking to the person themselves