No.
There are a lot of reasons why a woman wouldn't be vocal during sex. If she's not 100% comfortable with her partner or if shes just shy in general she might not want to make noise.
Not everyone makes noise to begin with, although sounds like moaning can be a confirmation that the sex is good, just because she doesn't make noise, doesn't mean she isn't enjoying it anyway.
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When a girl moans during sex, it means that the guy is doing his job well. She's moaning out of pleasure and enjoyment, so it's a signal to the guy to keep going. The louder the better!
Yes, some guys moan during sexual activity as a way to express pleasure or arousal. Moaning is a natural and common form of vocalization during intimate moments for people of all genders.