Quoting TantricLemons:" I have never not left a tip. I have been serving for 10 years and I have never made more than $200 on ... [snip!] ... so much. In my opinion if you got food than its your responsibility to tip. I might be in the minority, but that is how I feel."
I agree whole heartedly!!
I've worked in the food industry off and on since I was 18. That IS your paycheck. If you can't afford to pay someone, you shouldn't ask them to work.
That said, it DOES sound like you got smurf service. HOWEVER - You mention that she had a large group of guys that she was also working with. I can tell you, if you are a young female and even moderately attractive, a group of men gets DEMANDING - I swear it's a game to them. It sometimes comes at the risk of other tables. Also, bigger groups tend to make bigger tickets - and bigger tips. But you have to keep them happy to do it - which, especially with large groups of men, can be very difficult if you don't sacrifice some attention to other tables. Combine the two, and I can't say it suprises me at all that she wasn't a perfect server to everyone. She SHOULD of asked for help from another server though, unless it was later in the afternoon and she was the only one on - a position that tends to get saved for stronger servers, since it's a position of sink or swim.