You can easily fix this yourself and have someone else paint it, just go to your local parts store or Walmart and buy some supplies: different grades of sand paper, bondo or evercoat, etching primer, sand block and a primer sealer. Sand with the heaviest grade of sand paper first (150-200) over the major damage. Then follow with 300, then mix up some magic putty and slap it on the dented area, and try to make it look as pretty as possible like icing a cake. sand with 300-400 til smooth. If you see any pin-holes add some more layers and sand again til smooth. Apply your etching primer to fill anymore imperfections and prevent rusting, apply 2-3 medium coats until no pinholes are viable. Sand with 500 untlil baby butt smooth, then apply 2-3 coats of sealer with 20min flash time in between and finish with 600 sanding and then 800 and feathering 8-10 away from the damage area careful not to go through the clear-coat. Simply drive to the back of your local body shop and talk to one of the painters about doing a side job for some beer and cash and you my friend have a good looking ride

Oh and make you sis pay for the products, beer and paint guy

Or skip all of the above labor and just drive to the back of the shop and ask how much beer, pizza and cash to do it all