3 year old staffy suddenly obsessive over toy and randomly aggressive

So my dog has anxiety and whenever she gets stressed we put her squeaky toy in a blanket and she likes to get it out , like a game. Two days ago shE became obsessive crying while walking around holding it in her mouth , she even cut our walk short and went directly to her toy. She's been sleeping over it and licking it like a baby . And she started barking at our other dog who was just laying there and ran up like she was going to attack him . She hasn't bitten our other dog but I removed all food and toys, which she is completely normal now . Any ideas on what could be going on ?

I'm no expert but have heard that dogs can treat toys like their own puppies, I think it even has a name so it could be that.

Is it a phantom pregnancy? Is she spayed?.

Sounds like a phantom pregnancy,she should be fine again once the hormones settle down.

Doh that's what I was thought it might be

Thanks everyone I think this maybe what it is , she is exhibiting all the mental signs with a false pregnancy and no she is not spayed so hopefully it's just hormones fluctuating. We just have to wait it out.
If anyone has any advice on a false pregnancy or more opinions on what it is going on with her I would greatly appreciate it.
Thank you all.

She's definitely having a phantom, Katy did exactly the same when I gave her a new ball She walked around the house crying then trying to make a nest anywhere she could. But the saddest part was her trying to nurse/feed it I'm sure she would of made a great mother but we got her spayed as soon as we could.