Your female needs to be at least a year old to breed and quite a bit larger, so you have a lot longer than a few weeks to go before you should try to pair them up.
You said she's not as big as the male, which is a prime indicator that she's not big enough. Mature adult females are usually always bigger (built a little heavier) than males.
The general weight guideline is no less than 35 grams for a female and at my place, I only place males with females that are at least a year old.
A six month old female Crested will most likely not be able to produce eggs, but it's not just a matter of if you find eggs or not. If you get impatient and try putting them together early, she could become eggbound or calcium deficient (resulting in MBD), both of which could cause death.
Just wait until July or so and then put them together. It'll be well worth the wait. 
-Anthony
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Anthony Caponetto
www.ACreptiles.com