Shopping expedition

My grandma decided my mom needs clothes that are not t-shirts. She gave me $100 and asked me to get my mom some nice clothes.

This is proving harder than it should be.

First of all, without her trying them on, it is hard to know if it will look good.

Second, I see a lot of things I like, but wonder if she would like them or not.

So far, I've spent $46...and gone to nearly every store in town. I'm running out of ideas for where to spend the other $54.

Any suggestions?