She seems to feel fine today but how do I keep her calm? They told me if I wasn't right on top of her to keep her crated?

Is this what you did? She goes back in 10-14 days to have the stitches taken out. I don't want her stitches to tear

and is it ok to let her in her playpen? I haven't ever dealt with a spaying, Yoshi was neutered 6.5 yrs old and did great.