E.F.
I would take it for now, get her started, and get on the wait list for Wednesday. When Wednesday comes up (and it will), switch to M/W or W/F...or just add it, if she loves it and you can afford it. Why? b/c if there are holidays or the school takes a day off for whatever reason, it will *always* be on a M or a F. When we did M/F for a class, if felt like every month there was a cancelled class (that we still paid for).