OK - Be prepared for me to have my say at the end of this - but for your girl's sake.
Begin counting from the first tie - her first due date would be 58 days from that date. Her last due date will be 63 days from the last breeding.
X-rays are a waste of time until the 55th day - skeleton will not be calcified until that time. Find a Vet in your area that has experience with toy dogs and that works with breeders. YOUR'S DOES NOT HAVE THE EXPERIENCE AND SHOULD NOT BE USED EXCEPT IN AN EMERGENCY!!!!!! An inexperienced Vet will screw up the x-rays. Find a breeder of some toy breed in your area and see who they recommend. And I mean an experienced breeder - not someone that has had a few litters.
Get the book - The Joy Of Breeding Your Own Show Dog. Read it from cover to cover several times and then read it again.
Keep her well fed, with plenty of water - give her exercise. The better shape she is in the more likely she will be able to whelp.
Do not start calcium before she whelps - this can lead to eclampsia.
I would highly recommend that you not try to whelp the puppies yourself - if you can find a breeder in your area to help you - DO IT!! This could mean the life of your girl.
If you have more questions - ask them
NOW - You have done your girl a great injustice. This is the same as letting your 12 year old daughter go out and get pregnant. Your girl is no ready physically or emotionally to have puppies. She is still a puppy herself!!! She is not equipped at this point to raise a litter - no matter what her size. I hope this will not end in tragedy - but I have seen many of these tinies die in whelp. I pray that yours will not be another statistic.
I will be praying for your girl - but not for you.
Charlie