Based on what is in the question I would say no. A work related email signed with xxxx doesn't mean anything.
I received a work related email addressed only to me from a female colleague of 10 years (Also my manager) with xxxx at the end of it. Is this showing affection and if so is she trying to hit on me even though I am married?
Could just mean "hugs". I wouldn't look too far into it or you could embarrass yourself. Lots of people sign off with "hugs", probably doesnt mean anything more than that.