Sorry, just got your PM, but thought it better to reply here.
Is she 65 days from the first or second (or other?) mating? Also, what days of her season was she mated and did you have her ovulation tested?
Bitches quite often go 66 or even up to 70 days prior to whelping, although 60-64 is most common. The problems you have is all breeds are different and you're not sure what breed she or is a mix of exactly. Also, if she is only having a small litter, that can cause problems with whelping as larger litters mean the uterus contracts more easily and puppies are birthed more easily.
Early labour can last for 24-48 hours. Have her waters broken yet? If she has I would keep a very close eye on her and if contractions don't properly start within 6 hours I would get her to a vet to be checked to be on the safe side because of your own inexperience, the fact the bitch hasn't whelped before and that it is a small litter. It is also possible that your vets will have her in for whelping and this might be something for you to consider in case there is an emergency.
Once she starts having obvious contractions and is pushing, if no puppies are born within an hour she needs to get to the vets as a matter of emergency, the same applies 'in between' puppies too.
Are you aware of what to do during the actual whelping? Has someone experienced/knowledgable gone through this with you?