Girls talking about marriage?

OK my girlfriend of about 2 months started talking hypothetically about marriage the other day, who her bridesmaids would be, what kind of area she wants to end up living in, etc.

She then turns it to me and asks who my best man would be and who would be on my end of things. Well I tell her, but I don't have enough guys on my side, so she goes "Well if you add in my brother, that would even out, so you'd be covered there"

My question to you ladies is, if a girl starts contemplating the possibility of them and their boyfriend getting married, does that mean she's seeing things as more serious, and ending up long-term, or is that a thing girls just do anyway?
Girls talking about marriage?
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