She believed in Herself.
Even though, her mother was too biased towards Ross and always criticised Monica. She believed in herself and fight for what she loved. She always did what she thought needs to be done.
She was capable of breaking the stereotypes.
This is when she proposed Chandler in a beautiful way.
She is honest with what she’s doing.
Even when she didn’t like her Job, where she had to wear fake boobs. She still had full dedication towards her work.