So would that make the purse a proper holster?
Never.
Purses are a terrible place to carry a gun for a long list of reasons:
They're often lost. Left lying around the house, or on the roof of the car.
Cant feel someone else messing with it.
Its not 100% under the owners control 100% of the time.
The CCW purses have zipper pouches, but they're not kid-proof.
The ladies often switch them around, carry one today, carry another tomorrow.
They will always be a place of intrigue for a child. Obviously.
A purse is a convenience tool for women, a place to keep their personal items.
Carrying a gun is never convenient, nor should it be, it should be slightly uncomfortable regularly reminding you its there and that your responsible for its care and security.
This lady's family is trying to paint her as responsible, not careless, etc... at the end of the day she let her kid get a hold of her gun, out in public, where anyone could have been shot.