She said that since I was so adamant about keeping them indoors, that she thought declawing them would insure me that they would be indoors! ???????
I can see what she means, as declawing is associated with inside cats. Declawed cats can't be allowed outside for safety reasons.

I think you should decide whether this lady is genuine or not. As SASVermont says, you might be able to re-educated her, for the better.

You can always get her to sign a contract as Jen suggested, saying these cats are to be 'inside cats WITH claws' or else, in their adoption paperwork.

If you are not sure, keep hold of these precious babies yourself.

Ps. I am anti declawing.