Well.... 2 things:
1) I object to the $60. Just thinking back 20 years ago (and then actually looking up inflation rates) $60 = apx $120 - $200 these days (possibly more depending on what was being purchased with it. Food is apx 4x what it was in 86, as is gas). $60 just isn't a lot of money today. $200 to anyone, but a teen in particular isn't something to be sneezed at. $200 can feed a family for a couple weeks. I believe if you ARE going to pay it back, it should be not the amount you stole... but the value of what you stole. Just my 2 cents.
2) Who is it going to make feel better? Both of you, or just you? A REALLY vital rule in "making amends" is causing no more harm. Was that money for a prom dress she never got to buy, wages from work to help feed her family or pay bills, the difference between being on a team or not, ANYTHING that was immensely painful for her or her loved ones? Or was it 'no big deal' money? Do you know her well enough (now) to know if fessing up is going to hurt her a lot, or make her feel better, or be "Cool! Windfall money!"? Sometimes part of making a true amends (in my experience) is keeping my mouth *shut* and living with well deserved guilt in order not to hurt the person a second time. ((In such cases I try to 'pay it forward')). So I would personally think long and hard before doing something that would make ME feel better, if I have no idea how it would make THEM feel.