I agree with KISS, it sounds like a motherly instinct.
We had a male (suprisingly) that did the same thing, he would sit down and actually suck on toys until they were sopping wet crying occasionally.
We also had a female that would 'nurse' toys... she would actually push them up under her and try to feed them.
The female grew out of the behaviour and eventually stopped but the male did his 'toy sucking' until the day he died.
Is your dog spayed?
Getting her spayed would certainly help if it is an issue with thinking the toy is her puppy.
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