Oven temp too high or rack in the wrong place. Had a friend years ago (35-38) who told me she couldn't make meat loaf because top burned and it was raw inside. I had to tell her to turn her oven down, it was military housing so do not know how accurate the oven was. It worked.

Banana bread is dense, put a sheet of aluminum foil (tent type) over the top partway thru the baking time, then stick a toothpick in the center after baking time to assure being done, batter should not stick to the pick.

Totally agree with this one. You can tell when a cake is done because it'll pull away from the sides of the pan. Last yr we baked a turkey at my daughters house that would never get done. Now we do all the major baking at my house. Get an oven thermometer and gage it. It sounds like she may have to set it higher to get the 350 needed.

OP did you friend ever get her oven issues sorted?

I do not have a gas oven in my house, but do in my camper. I have to use a large unglazed tile in the camper, preheated, on the rack under the pan to get accurate baking.

I have a gas oven and I have to use an oven thermometer. Also is she always checking the process. Leave the oven door shut. I don't bake anything when DH is home. And when they say "preheat" they mean "preheat". When I use the oven thermometer, I turn the oven up to the recipe temp and check after 10 minutes but quickly. if you have a glass door make sure you can see the thermometer without opening. That way you can adjust with out opening the door. I get after DH all the time when he puts something in the oven. He constantly checks and therefore the oven temp is never correct and it takes forever to cook.

My friend appreciated all your responses. She is on vacation now, but plans to get a thermometer and see if her oven is too hot.
Thanks for your input! ☺