Camera won't focus and my pictures are coming out blurry.

So I got this camera as a birthday present and it's been working really well. I love the photos it takes but now all of them are blurry. I can see all of them just fine but there is a big blurred spot in the top right hand corner of every photo. I let my daughter use it the other day with her friends, so maybe she got something stuck in there or on the lens itself.

I may be savvy when it comes to taking pictures but I know nothing when it comes to fixing these kinds of issues. Is it possible there is maybe dirt on the lens? And if that's the case, how would I go about taking it apart or fixing that issue?

Thank you so much!