Nope you won't be able to socialize the momma with your pets, 14+ is bang on, she is a great momma who is protecting her kittens. At this point you need to keep momma and babies together alone where she can quietly and peacefully raise her kittens. Right now, the momma is stressed and the kittens are learning from her to lash out at other animals, not good for these cats who may be adopted into a multi pet household.
You can, however, take the kittens out of the room for outing to socialize for a bit with your cats, just be careful when you place the kitten back that you rub all the kittens together so your pet's scent won't be so obvious on the kitten.
Cat maid to:
Puddles, female Himalayan (16 yrs)
Jasper, male Ragdoll ?? (approx 9 yrs)
Sweet Pea, female silver tabby DSH (approx 7 yrs)
Rose semi feral, a cpietra rescue, female tabby (approx 6 yrs)
Snowball RIP (1991-2005)
In a cat's eye, all things belong to cats.-English Proverb
“While we are free to choose our actions, we are not free to choose the consequences of our actions.” Stephen R. Covey