Help - Camera Selection Long tele, low light

Hi,

I need a new Digital PS for my wife since her current one won't do the job.

She is going to be shooting my daughter at her volleyball games indoors. So,
here is what I think I need:

1. Long Telephoto (10-12x)
2. Very good low light performance
3. Very good sports performance
4. Very easy to use
5. Budget: Under $500 (I hope)

I've been looking at Olympus, Panasonic, Canon and others but I'm not
knowledgeable about cameras and the specs are confusing.

Thanks in advance for your help.