The sk8strong DVD series is excellent. You should look at these. Alternatively, yes, a good trainer to set up a program is a good solution too.
However, the strength is not the entire issue here; balance and "orientation" is also significant, and that will take time to overcome; plus you would be entering puberty in all likelihood, which will create other body dimension changes. All skaters go through this; it takes time to overcome, and there is no "magic" solution. This is why many skaters quit at this point in frustration. The ones that work through and accept the setbacks, new challenges, and, also new opportunities, make it through to the "other side".
What does "pressups" after falling mean? And, I'm not sure why they are trying to decrease the knee bend on landing - most coaches actively seek a good, deep, soft knee on landing, as that is what you want to see in terms of controlling the jump. I must be misunderstanding something.