Friend leaving/pushing me out?

[SoberBee]

Introducd two friends. We all have similar aged children.

(A) can be needy and intense, texts everyday and comes over at least twice a week (often just turns up), invites back periodically but 90% of time I am expected to host. She moved to area a few months ago and hasn't really made any other friends.

Since I introduced A to B (long term old friend) last week, A has set up a day out with B. I only know about it because B assumed I was invited. I mentioned it to A and was told it'd be a bit much with all our children...! But they are all coming to me later in week (I organised this before I found out about them meeting without me).

Aibu to feel A has used me while not knowing anyone else and has now found someone preferential? I feel a bit precious to be hurt over this, but I am nonetheless.

I should add, reading back it sounds like I don't like A very much, but I do! She is sweet and kind and I put the intensity down to her being lonely. I am happy she is looking for more friends, but it feels like she is desperate to befriend B at my expense.

Let them get on with it. If B is your old friend she will be loyal to you regardless.
Continue to AR range stuff with B without A, A withot B and A& B together.
If A turns out to be a PITA, cut her out.

A sounds like a bit of a Wendy.

Marie Dubeque does a good vid about this on YouTube entitled Friend Poaching.