All G1s are worth rehairing in my opinion, I mean if their hair is gone but they're in good/ok condition otherwise.
*)Rehairing is not difficult at all, only frustrating and time-consuming at times.
You don't even need any specific tools, the rehair tool may be worth investing in if you're planning to do a lot of rehairing, but if it's just one pony the wire or needle+thread method should work just fine. And there are plenty of rehairing tutorials available on the net, for every method.
Anyway, I wish you good luck, it seems you already have someone offering to do the job for you if you'd rather not do it yourself.
edited to add/
*) Of course there are ponies that are more valuable in their current condition than rehaired, but that's another story... Snowflake isn't one of them.