Fiorella may not be a slug-a-bed, but she is a slug-a-tub. Get her in a hot bath and she'll stay there forever--or until the water cools an hour later.
For Fio, hot water has curative powers. If her muscles ache from chainsawing or she has a headache or she can't sleep, just dunk her in the tub for a while and she'll recover. Or, if she's already had her quota of baths for the day, supply her with a hot water bottle.
Hot water, the natural cure-all.