Lol - you don't see a mom helping her daughter out with her lesbian love life very often :)
In fact the only other example I can think of is in Touhou and a few examples of Alice's mom trying to hook her up with Marisa or Patchy.
The three mothers of MakiRinPana all get together to buy them a house in that ongoing MakiRinPana polyamory comic.
And there's another one I'm thinking of where one of the two romantic girls' mother is smoking and basically says "Yeah, I'd like my daughter to find a nice girl". Can't remember which one that's from, though. Driving me nuts.