Although, in her case you would sew a lot. Pretty much the entirety of her work would be sewing, and a lot of it.
When you see that in movies, it's not like it's a hobby, it was a legitimate economic activity engaged in by elite women, producing high quality textiles and tapestries and such.
An alternative would be "Yeah, you going to a Nunnery".
There would be a greater range of potential activities there of course, although a gently born woman probably wouldn't be doing a lot of mucking pigs or gardening, probably.
Unless it was absolutely politically necessary because there was NO other sister that could possibly be married, that's how they would have dealt with such an inflexibly bitchy and uncooperative case that just would not get married.
(Although she would have had to have acted fucking crazy/disfigured herself to get out of it.)
It would amuse me to see a comic that reflected women's lives in the period, and it probably exists and I haven't seen it.
And assuming she took a normal course in life she might also potentially get a "sweet" position being a lady in waiting or close confidant of a higher ranking noble or royal, which would mean actual work helping THEM with cleaning and dressing and stuff. (Royalty were too good to have some peasant help wipe their ass or dress. Being the guy that helped Henry the Eighth Wipe his fat, probably hairy ass was a good position. You got to talk to him, and he would have been inclined to take your side and give your family favors.)