So you had to ask her to call the restaurant instead of just relying on her online information?

I think this is like my experience. Instead of going the extra step and making a call they rely on what they have online. This strikes me as a bit lazy and unlikely to result in the desired outcome. I can look at online reservations systems just fine by myself. Where a concierge can come in handy is doing a little leg work to see if there are other options.