I didn't mean to accuse you of not caring for these kids as much as you do your foster children. I said it was a concern of mine. If you don't give the foster children short shrift then there's nothing to be concerned about!
If you told your caseworker that the most you could take was two she knows she's streching your boundaries and that probably explains her responsiveness to you. I'd give it a few more days, like you said it's the first day and then if you decide you can't handle it I wouldn't beat yourself up abou it. It sounds like your heart is in the right place. I am sorry if I sounded accusatory.
If you have a health concern that you are taking medication for it can be exacerbated by too much stress. Please keep checking in with your cw about how you are doing and try to get some respite care.
Yes, I would prefer that a daycare provider be opverprotective but not at the cost of her health. If it's costing your your piece of mind that will affect the care you can give your children. Please know that I support you and don't doubt for a minute that your heart is in the right place. Trust your heart.