I would bet it will be soon now! Just remember as long as she is relaxed, not crying overly long, and is not restless, she should be OK. Especially between kittens. If she strains and acts restless for longer than an hour when she starts contracting, give your vet a call. There will be some low cries, and you will see her contractions. Make sure the mucous/birthing sac is away from the babies nose, and she is stimulating it by licking it. Some mamas get very tired and you may have to help. Please keep us posted!