A little background...chick at work who i've been friends for about a couple of years...didn't really see her as anything more than that until a few months ago. We've only hung out outside of a few times at after work happy hours, never alone, but we do converse on email from time to time. Anyhow, both of our birthdays are coming up at the end of month a few days apart, so I thought of getting together with her sometime in between our birthdays. While conversing on email...
me: "oh by the way, since your b-day is a few days after mine, we're gonna grab a beer sometime in between our b-days..FYI".
her: "Yep! man Im getting really old

We need to round up some work people."
I said nothing insinuating having anyone other than her and myself. I kind of left it at that and didn't make that point to her...but is it pretty safe to assume that any woman in that situation who suggests to have others come along really isn't intersted in a romantic way?