Help what's wrong with my little girl?

My daughter is 11 weeks old now and yesterday she was extra irritable and grizzy more then normal. Then last night she had a terrible sleep, she went down at 7.30 and would normal sleep for 5-9 hours and only wake 1-2 during the night but last night she woke at 10.30pm, 12.30am, 2.30am, 5am then 6am and we're up for the day. Each time she just wanted to feed but would only take 1/2 a bottle. She seemed to have more wind but this might be cause I was awake more and noticed it. She hasn't slept this bad since we were in hospital. Also one of my friends reckon's she's teething as she keeps chewing on her dummy/pacifier and bottle teat. I thought maybe a growth spurt but she wouldn't take a whole bottle not sure if that's normal. Anyway got any ideas or experiences?