Aww I know it's going to be hard for you to have to be away from her for awhile, but you have to do what you have to do especially since it's for your health.
I went on vacation for two weeks last month and left my bunnies with Chris. Their feelings for me didn't change at all and they treated me the same as they always do when I got home again. I don't think Ruby will forget about you at all. She may form a new bond with your mom, but rabbits can be friends with more than one human! Her liking your mom shouldn't effect how she feels for you.
If your worried about her missing you, you could have your mom give Ruby things like tshirts that you've worn, so that she can smell your sent. Or you could get paper towels or something and rub them on yourself, so they smell like you, then give her those. Cuz I know when I give my bunnies clothes they just tear them up, lol.
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