Sounds like she's a gal guys don't stick with, and if her D is in jail, I'd doubt her parenting.
Don't make bonding with the baby such a milestone. Some guys don't until the baby is more reactive. My H didn't bond until our son was a toddler, and now he values that relationship very much.
Patience is the watchword. You need to bite your tongue, keep your questions quiet or tempered, and be ready to wait.
If it helps, numbers are on your side!
Can the gal whose H had an A with the same OW give you any insight? Would you feel comfortable talking to her?