Lildonkey the biggest issue is the fact she (and you to some extent) are playing the theft of images off as no big deal. I'm sorry, but it is. I have had my art work stolen from me and I know of others who have as well. Not a good thing to go through. You get caught stealing and using other people's works without their permission in witting or from a free use sight (keep track of where you get the images) and you could be prosecuted to the full extent that the law allows, which in some case is jail time and/or hefty fines.
There are people who will go directly to the artist if they see you are using the artist's work without even giving you a heads up, and the first time you hear about it is when the artist contacts you or their lawyer does.
Both of you are young and we are trying to get it across that this is theft no matter what way you spin it.
Hiding behind your age is a cop-out.
Do you think that a young child that steals from a store or other place isn't going to get in trouble? Maybe a warning the first time, but repeated stealing would/will be dealt with by the law with no regard to the fact they are young. At that point they should know better. Same concept applies here.