Would you let a 12 yr old watch your kids if your kids were 5 and 7 yrs old?

I feel like since we are past the baby stage and both kids are pretty self sufficient it would be fine - she lives 2 houses down so I figure she can call her mom if she needs to AND she only charges $8 an hour - we pay our 24 yr old babysitter $15 per hour right now.

She took a Red Cross babysitting class and is certified in CPR and first aid.

I am so torn on what to do - DH says we should use her and save some $ on sitters

WWYD?