That kayak is too small for you. Including your clothes, the paddle, your PFD (required in all states) and any water, snacks or camera you carry, you will be 25 lbs or more over the limit. This will make the boat slow and unstable with a lot of drag. Since these cheap little boats don't have sealed bulkheads to keep from being flooded (which means they will sink) and the cockpit openings are so huge, this is a very unsafe condition for you.
While it was nice of her to give you a gift, it would be better if you could exchange it for a longer and larger kayak with more volume to balance your weight. Somebody your weight needs at least a 10' long kayak to get that flotation volume. I realize that you will not find one new for the $150 she probably paid for the Pursuit, but if you could kick in $100 yourself you could trade up to a Pursuit 100. Still kind of a low end kayak (and it will still be slow and not safe for large lakes, fast rivers or the ocean) but at least it would not be dangerous in a small lake like the 80 model will be.
Tip: the best economical choice for beginner kayakers on a budget is to buy a used boat on Craigslist.