Well....if you do the math and she goes for 3 hours a day for two weeks...that would be 15 hours a week x 2 so...30 hours of babysitting time. That's about $6.60 an hour.
There is nothing cheap about someone watching your kid. If they are doing activities with them and are certified well...you get what you pay for. They SHOULD be doing more than your average highschool babysitter. Food for thought.
I would also see what they provide. Are they providing snacks? Lunch? Do you have to bring in a care package of tissue, papertowels, etc...?
We pay quite a chunk of change for the kids to take Kindermusik. It's really a great program, though. Ds has been doing it since he was 1 year and he is now 5. He can sing, read 5 or 6 notes on the staff and play them on the glokenspiel. It's really been fun to watch it come together. He really loves music!
Hope that helps