You know, I've read this thread with my jaw dropping.
There is no way in hell I would be interested in a pup from such a litter.
I very much doubt anyone else would pay for one either.
It's such a shame that the OP seems to think that because her bitch picks up hedgehogs that she's maternal, or something!
She's probably bored, and would like to play fetch.
I hope the OP just relaxes about breeding and just enjoys her doggy. And gets her spayed.
It can be difficult to change minds especially if everyone is advising you against what you thought you'd like to do OP, but I do hope you change your mind, and just let your lovely doggy enjoy her life and that you don't put her through this uncertain and dangerous ordeal.
Maybe talk to a friend or two about your own personal and psychological reasons why you are even considering this last gasp attempt.... Your bitch is very old to even be thinking about breeding from her.
it makes me think are you coming to an age where you can't have any (more) kids yourself, and are projecting your desire for a (last) child onto your doggy?
Something to think about maybe?