！。
Yuki! It's so nice to see you again!
Literal
Yuki! Again meet-potential-[so-て] happy-[sentence-final-わ].
A warm greeting. 会えて is the te-form of the potential form 会える ('to be able to meet') — here functioning as an emotional cause: 'happy because [I'm able to] meet you.' The sentence-final わ is stereotyped as feminine but is common in emotional exclamations regardless of gender. An exuberant reunion.