Probably your best bet.
Rocky Mountain National Park will be open, but it's a long drive to get there from spots like Summit County or Vail. Plenty of foo foo day spa type places up there.
If she is active and wants to get some sort of recreation in, hiking up the East Face of Quandary is a good one. You can follow the ridge line, making the avy danger pretty much nil. It's a relatively easy hike for a 14er. She might want snow shoes, but most seasons you can do it without them. Of course you are going to want a nice spring day to do that. If there is any weather in the forecast, forget it.
There are always mine tours at the Climax mine in Leadville.