There's nothing wrong with writing something, getting feedback on it, and rewriting it. It would be a problem if, say, her mother was writing it for her.
Your parents don't necessarily need to be 'well educated' to be able to read something and give you their opinion. Alternatively, you could ask your teacher to give you feedback before the final deadline; they're often willing. Or, perhaps, ask a friend to check it over for you. I used to have a system with my friend where we'd proofread each others essays (this was in college, though, it sounds like you might be in high school? Either way, it still applies).
As has already been said in the previous comments, there will always be people who have advantages. You can't do much except work with what you're given.