Ohhh, how beautiful! That is so precious! Yeah, I'd sell them for her. Make sure she knows there's no time limit, so she doesn't get into a frenzy and wear herself out. But go for it! Why not? It'll take a couple fo minutes out of your day, and make a darling pensioner a few $$$ richer.
Don't feel so bad about her spending the money. Pensioners are pretty awesome with handling their cash. My nan always amazes me with what she can do on not much.

Good luck!