Um, are you kidding me? You aren't forcing her to drink it. How on earth is it "offensive" to have it around. SHE can not drink - that's fine and that's her choice.
I actually find it offensive that you're expected to scramble and "hide" the alcohol in YOUR OWN HOME because ONE person has an issue with it.
If she's "offended" then she doesn't have to come. Your family drinks, she's marrying into your family. To hide it now is to only set up the stupid expectation tha tyou all won't have alcohol when she's around.
Is this what your mom really wants to do?
This is so ridiculous.