Sounds like me.  I once asked a mum from my daughters school for a play-date as my daughter had formed a nice friendship with her daughter.  Sounds simple but it took a while for her to say yes and when she did, she said it had to be at her place.  When the day came of the play-date, she was pressed for time.  I have to leave at 11.30 sorry she would say.  Before we left, I said we should arrange for a play-date at my place next time.  She looks at her calendar on her phone and tell me there is no availability till the next year which was a couple of months away.  Really made me feel rejected and I felt sad that my daughter couldn't have another play-date with a very good friend.  I learnt my lesson that if someone wants to make the effort they will.  I should of just asked her once about having a play-date in the first place.  Not followed up like I did.