Love...what Shelby is getting at is that the issue you stated doesn't make any sense.
"My horse is always trying to run from the jump, but if I don't let her she rushes it."
Run from the jump?..does that mean she is afraid of it and runs away from the jump, as in goes past it and get away...avoid it or is she just getting strong after the jump and you can't control her speed? You said if you don't let her than she rushes it...why would you want a horse to run away from a jump? The issue is listing both a possible before and after problem so it is contradicting just in the question :)
Let me see if I can take a guess. Making an assumption you are talking about taking two jumps in a row, a line, the horse speeds up after landing from the first jump and then wants to rush the next jump as in you can't shorten the horse up and re-balance prior to the second fence?