Yikes, I'm so sorry!

Has Baby had a Thyroid panel done recently? Sometimes the Dodd's panel will find some deficiency that can be addressed with medication. A normal in-clinic T3/4 test will not be sufficient because they may be normal while the rest is out of wack.

I'm not familiar with her history. Is she a rescue? If she came from a breeder that you know, the breeder should have the first option for intervention (most I know, request this in writing). Some rescues actually do take dogs back even if it has been years.

It is very likely that she is a very sweet dog. Baby's behavior was very focused on taking out Tikeya but I know that girls can get into it (Baby's at that age where ranking can get to be an issue), but I am concerned particularly because of the misdirected aggression... people are getting bitten and considering Baby's size...

If the bite that your mom took previously and again this time, were inhibited bites (or more worrying, if not) and Baby calmed down immediately when she saw her goof, then I do agree placement in another home (after a vet check and a full thyroid panel with auto antibodies screened) may be the best solution.

Tension in the other animals and worry can do much to shift the stability in a home.

Caution: In some locales and in placement/rehome situations, if the dog has bitten someone, and there is not full disclosure, the person who rehomes her could potentially be at serious risk for liability. The placement agreement (one that includes the stipulation to take her back if it doesn't work out) may require that the understanding that she has bitten a human to be in writing.