I hope everything is alright on this front as this is way more important that softball.On a personal level, my poor daughter is dealing with something very difficult (and very personal) in her home life that no kid should have to deal with.
If your DD feels the need she could probably just say coach had a lot of heavy stuff going on in my life last weekend so I wasn't really myself. But it's probably not necessary if either you or her don't feel comfortable bringing it up.