My baby girl is 3 months old I'm a little bit concerned that she isn't getting enough milk for nutrition her feeding habits go a little something like this:
8-9 am bottle 150-180mls
12 noon bottle same as above
4pm bottle same as above
8pm bottle 170mls

Then she won't wake until 7.30 8 in the morning I have tried to wake her in the morning at about 6 but she just doesn't even if I undress her is this enough for her she is gaining weight and is happy apart from she has just started teething at this young age.

As long as she is gaining weight and happy this isn't an issue. It seems you have her on a good schedule.

Sounds like a happy healthy baby to me.