Have to vent - but also need some advice please!
Separated from exh about 6 months - he lived at his mums for a while, and has recently moved into a flat. He has ds overnight a couple of times a week.
The usual procedure, is that I drop off ds in the morning to either exh, or ex mil (depending on which shift he's on) and then pick up from either one after work.
I've been off work sick today and yesterday, and send dd to pick up ds from mil this afternoon - dd has told me that she asked where I was - dd told her I wasn't very well, whereupon she was allegedly quite off with dd and said something along the lines of 'well I'm not well either' 
I know this sounds like something really petty, but it's the latest in a catalogue of snide remarks, and I'm starting to get cross. DD was only picking ds up instead of me... it was earlier than usual because I didn't think it was fair to lumber ex mil with him after school while I was at home. So what's the problem?
Dd is mine from a precious relationship, and since we split, neither my exh or ex mil have had anything to do with her. She's 12, and she was doing me a favour, and I'm pissed off that ex mil spoke to her like that.
Do I ring her and find out what her problem is? Do I speak to exh about it? WWYD?