Generally, it has the sense of emphasizing on a person's particular character or way of being.
some words are missing in your sentence
this pleasure is so .....
so much, very much
"you are so cute"
merci de travailler tellement dur means "thanks for working so hard" in English.
In French, you can say "Tu es tellement agaçant(e)" to mean "You are so annoying."
I would very much like to....
I love you so much
i vous aime tellement
If you mean 'elle' as in French, it is hi.
elle s'assoit mean she sits or she's sitting.
elle l'aime means she loves him (or her) in French.