。
She has lots of friends here.
Literal
She [topic-は] here [at-に] many [of-の] friends [subject-が] exist.
A clean example of the ~には~がいる existence pattern: with animate subjects, いる ('exist, be located') works alongside the location-marking に. The double-particle reading 'she — at this place — has many friends' is more natural than treating 彼女は as the possessor; what's being asserted is the existence of friends in a particular location, with 彼女は as the topic the assertion is about. たくさんの ('a lot of') is the attributive form of the adverb たくさん — when modifying a noun, the linking の is required.