Does she like photos, maybe you can pick some of her favourite photos and get them done as canvases?
Do your siblings have kids at all, maybe buy a big canvas and gets the kids to attack it as a 'special' gift from them.
DD was 10mth old on fathers day and i let her crawl all over a nice bug canvas with non-toxic paints.

For my MIL's 60th we got photos of DD framed and we paid for her birthday party!

Maybe you could all put in for a weekend away or something for her?

It's so hard when you don't know the person but i HTH.