MOO dragging me into her crazy... Need help with reply!

My MOO is the neglectful/victim/I can't remember/It didn't happen that way etc toxic type. I've been CO since March 15.

It was her 60th birthday yesterday. A few months ago, my AOO (Her sister) texts me to ask if I can help arrange her and my GOO coming to suprise my MOO.
I will post the screenshots later...
Any who, FF to yesterday. I had been thinking that my AOO and GOO would probably be there but because yesterday was my MOO I didn't want to message then because she always takes her bday off and I wanted to avoid that shitshow as much as possible. So I had planned to ask if they wanted to catch up today.
I get a message yesterday from my MOO (SUPRISE, she ALWAYS has to be gatekeeper) asking if I want to meet AOO & GOO at mcdonalds after school either thurs or frid afternoons, she would drop them off and pick them up... like a fucking package?!?
I BH'd, and was pissed she tried to play gatekeeper and "custodial parent" with my AOO and GOO.... My GOO likes to sit on the fence and keep everyone happy but I love her to pieces, and my AOO seems probably as mental as my MOO.
MOO messages a few hours later telling me GOO has left her phone at home so won't get any messages. GRR
I decide to BH, and screw her crappy crazy I wasn't playing so I set about my day like I had originally planned and decided to message my AOO the next day like I was going to.
After that she sent a FB message to me asking if I got the text and could I please reply. I BH'd. I am not friends with her on FB and have my setting locked down, except for blocking her messages apparently.
Later that evening the FMs start. I have a missed call from my SOO, not message left.
She was actually meant to come up this weekend just gone but told me she didn't come up because MOO was being difficult... She normally stays at MOO house. I thought it was weird her saying that but wondered if MOO didn't want my SOO there when GOO and AOO was there because then she couldnt be the gatekeeper. My sister would totally out crazy her and just bring my GOO herewhile my MOO still had her jaw on the floor I'm sure.
I struggle to deal with SOO at times too so I am LC with her at the moment too.
This morning I text my AOO deciding to act like I never received any texts or contact from MOO and ask if they made it up here and did they want to catch up.
I'll post screen shots below. I am trying really hard to behave normally in life, and it just seems like my MOO is making these crazy hoops for me to jump through and my almost 90yo GOO and AOO and willingly participating. FML.