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Welcome to Justanswer. I am Dr. Loretta, a licensed veterinarian, and would like to assist you. I will respond quickly after reviewing your question.
This is normal for her ...this may be part of the cervix opening to allow the kittens to pass through. Cats rarely have trouble, even when they are small, having their kittens but since this is probably Butterscotch's first litter, it may not follow the normal routine. Continue to watch her leaving her alone and in peace...you can peak around the corner to check on her but quite will be very helpful. The one thing you need to watch for is Butterscotch pushing all the time for more than an hour with nothing coming out...that means that she is in trouble and probably will require veterinary attention. In most cases such as Butterscotch, she will have contractions and then they will leave and she will be peaceful, then later more contractions until her system is ready. Patience is the key to delivery for Butterscotch so stand by and wait for these beautiful kittens to arrive.