Hi, the tenses in your sentence are all correct. One of the uses of Imperfect in Spanish is to express the equivalent to English "I used to". So "era niña" and "me gustaba" are the perfect combination. The only problem is the article: when you use the verb "gustar" to say "me gusta(n)" or "me gustaba(n)" directly with the noun, you use the article: "me gustaba la pizza" "me gusta el jugo" but when you use it with an additional verb you don't need the article: "me gustaba comer pizza" "me gusta beber jugo". I hope it helps, bye.

Está bien :) Pero no pongas " la pizza" , a menos que te refieres a una en especial ( ej: la pizza X del local X). Si es pizza en general, sólo pon pizza .

It´s right, because you´re using the expression USED TO, but remember if you put, I USED TO EAT PIZZA, that mean today no more. In Spanish equals than in English we use THE to difference something. THE PIZZA you´re talking an special pizza. cheer!! (Y) if you need help please add me on skype, visit my profile and there is my account :D

Yes, you have to use both, era and gustaba. They are two different verbs. Ser= To be Gustar= To like Moreover, you don´t need to write "la pizza" in this case. Only "pizza". Because if you write "la pizza" means a specific pizza and you are talking in your sentence about general pizzas. Maybe you don´t like eat pizza now but you did when you were a child. "Cuando era niña me gustaba comer la pizza de tomate" In this case we use "la pizza" because la pizza is made with tomato. :-)