Pre-lockdown what were your daughters interests?
You mention being sociable and missing her friends would she be up for arranging a zoom (insert other video calling tech here) party, planning the activities, coordinating a theme/dress code, working with her friends to plan food or a movie that they can all watch at the same time and chat over.
If she was crafty, would she use old clothes to up cycle into new ones or make into bags, rag rugs. Could she draw a mural on one wall in her room and paint it, that's a several day project. Great British sewing project is on bbc so she could get ideas from that.
If she liked outdoorsy stuff, would you be able to give her a section of the garden or some pots so she can grow her own stuff. Strawberries can be bought from the garden centre cheap, potted up in old wellies or self decorated cheap pots and they're quick to ripen and eat so not much patience involved.
If she likes quieter indoor activities could you get her to journal about the virus, write fiction, create her own poems or a novel based on her experience.
Puzzles, video games, she could design her own board or card game.