Friendship trouble. Should I tell her or should I forget about it?

I had not seen my best friend from college in 2 months. I was looking forward to catch up/spend time with her. My best friend and I were heading to the beach yesterday when one of my friends called so we invited her to come with us. Everything was nice and dandy until we got to the beach and had a few drinks. From that point on they formed a little click and I felt left out. My best friend literally gave me her back the entire time. They both were talking nonstop, laughing at their inside jokes, bonding, dancing, etc. At first I tried to include myself/join them but that did not work very well. They would not include me in their conversations or anything. I pretty much felt like I was their driver. I’m not the jealous friend type. As a matter of fact this is the first time I’ve ever felt this way. I guess I feel this way because I was really looking forward to spending time with my best friend who I haven’t seen in a while and that did not end up happening. I don’t know if I should bring this up and tell her (my best friend) that it bugged me or if I should just let it slide and forget about the whole thing? I don’t want her to think I’m making a big deal or that I’m acting childish. Should I tell her? If so, how should I tell her?