Hi Nicole-
I am a relative lightweight too, although not nearly as tiny as you are!
For you I also would recommend a Hobie 16, even a used one in good and well-maintained condition and at a decent price (unless you want to spend the $8 or more grand it costs now for a new one).Check the web for websites that give you tips on what to look out for when buying a used catamaran.I believe that a new Hobie16 is over-priced, and the quality has probably gone down in recent years. When I bought mine in 1995, the mast broke in half on its maiden voyage, because the casting was defective. Hobie knew about it but didn't recall the defective masts nor inform its customers.
I'd say, buy a nice older H16, or buy one from Hobie Europe.
I would not recommend a Hobie Wave, it's probably way too amateurish for you and your kids. It has no jib and thus is much slower to sail. However, if you single-hand a lot it may be what you want, you may even be able to right it by yourself if capsizes.
I personally also would not recommend the Hobie Getaway either, it is a very heavy boat to maneuver on the beach.On the other hand, many of my sailing colleagues love the boat as a family fun boat (I personally don't go for boat that have built-in drink holders, LOL!)...I think Hobie dealers are really pushing the Getaway on customers, it's Hobie's money maker.
If you are only 107 lbs, you probably can singlehand the Hobie in steady winds of up to 15mph comfortably(sailors, correct me if I'm wrong here).
I wish you good luck and much fun!!!