I'd keep going with putting her down and walking away when she does it. My DD (now 14) was a terrible biter but this ended up working. sometimes it gets worse before it gets better, but soldier on!
Other times though I would just lavish attention on her for a little while and then it seemed like she had enough of mummy (and I could finish that page!).
Just remember, she loves ya and wants to hang out with her favorite person in the whole wide world!