Question: My mom wants to do baking but her oven doesn't have bottom heating element. It only has an element on top, with a fan at the back.

She told me that she can't make me a good pizza or cake without it.

Is there any way around?

Answer: 
Many modern ovens seem to have unusual element configurations, but with a fan it makes no difference, just use as the oven manual indicates

Cooking a pizza in any domestic electric oven is tricky, as it requires more heat than an electric oven can generate. Using a metal or stone slab helps
I know using a cast iron skillet starting off your pizzas on the bottom rack depending on the thickness of the crust for 15 to 25 minutes and raising it to the second to the top for the last 7 to 12 minutes and the cast iron skillet will continue cooking once you shut the oven off to make it nice and crispy... I will absolutely not make a pizza any other way