Should I have my friend visit my kitties while I'm gone?

I will be going out of town next week and will be gone for 11 days. Goodness I'll miss my babies. I have a pet sitter coming regularly while they're gone, but I'm wondering if I should ask my friend to visit them as well. That's a long time to have such little human companionship, but OTOH, there really isn't anyone they know well so I wonder if having her come over would just add to the stress rather than help. She did check on them last time I was gone (just one visit) and said Henry hid and neither one of them was interested in playing, even though I left their favorite feather toy for her to try.

What do you think...ask her to come over a couple times or no? This would be strictly for companionship/playing as the petsitter will take care of litter, food, water, etc.

Also I know I've read some tips about leaving some of your clothes out, etc...any specific recommendations on things I can do to make this easier for them? And for me?

Why not ask her to come and see how it goes. Rather than try and play with the cats, maybe she should take some work, a book or something to do and just sit there quietly ignoring the cats and see if they get used to her and come to her. And she could divert them with some music or TV too. I think it would probably help them as long as she lets them set the pace.