If she’s a hockey fan, maybe she would like skating? There’s public skate at Steriti Rink and Warrior (where the B’s practice), check their websites for times. There’s also the aquarium, the Museum of Science (including the Omni Theatre), the MFA (I think the Impressionists exhibit will still be up in March), and the Harvard Museum of Natural History (a personal favorite). I usually do an early dinner in the North End before B’s games since it’s walkable—park in the Haymarket garage nearby. House of Art & Craft in Brighton also has candle making classes that I’ve done with friends, which seems like a fun “mom activity” :)