*can't use a trampoline and refuses to port into places above 100m high* lol...soo
You don't have to port. I can set you up with a boffo elevator you can use to ride up. If you ban her from your land and disguise the elevator she shouldn't be able to ride it up. Or to be even more secure, you can just ride a prim up. You rez a prim, then sit on it. Then while you are sitting on it, edit it and simply change the Z axis for position to the altitude of your "special place". *poof* you and the prim are instantly at the altitude and you can just stand up and delete the prim.