If she said in clear English "no tipping that's not nice" that's code for two things:
1. She knows you and that you usually do tip. You'll most likely do it anyways, but with a teasing manner you can make her take it as she playfully refuses. This can initiate flirting.
2. You can turn this into a small game with her. Instead of tipping after every drink you buy (which many people like myself do if they're there for a quick couple of drinks), do something like tip on the second drink and say she "has to accept it this time." Or even don't tip until the end of the night. Save up a little bit after each drink to slide her at the end of the night, but in the mean time, when you get another drink, ask her in a teasing manner if you're allowed to tip yet.
OR, since you have her number already, the chances are you've talked outside of the bar. This is good because you can try number
3. The next time she says "no tipping" to you then you can reply with asking her out to dinner or something of that nature.
Her: "No tipping, that's not nice!"
You: "Well if I'm not allowed to tip, then how about dinner sometime?"
Tip her anyways that night and remind her about that dinner. If she says "no, you broke the rules and tipped me" then turn it around by saying "I thought that only applied to the first drink of the night"