Is this behaviour because she is cutting Molars?

Over the past 3 weeks or so Georgia has gone from a happy calm little person to a biting, thrashing, tantrum throwing unhappy unsatisfied little girl.
I am so confused as to why this is happening but I am assuming its is due to something changing or happening. She has just been fully weaned from the breast so I thought this might have something to do with it, she is close to walking and also the health nurse said she has all four molars coming through. I can see one coming through for sure but not the others but she wont really let me check her mouth all that well.
She hates me putting her down and if I do she will throw herself face first on the floor, headbutting it and screaming. I have just been ignoring this behaviour and after a little while she stops. When she gets frustrated which is alot of the time lately she bites me really hard, I have bruises and marks all over my shoulders from her. When she does this I put her into time out for a couple of minutes which is just an empty play pen. She is most of the time ok after this.
Her eating has been still pretty good, a little fussy but not too bad.
She is covered in bruises also from her tantrums.
Sometimes I feel like she just hates me, I dont know how to help her I have been close to tears on a couple of occasions I hate seeing her like this.
I have done a little research into behaviour changes when molars are coming through and the stories sound similiar. I am hoping this is all it is and it will pass fairly quickly.
If you have any suggestions I would be very grateful

sounds to me like seperation anxiety, my DD is the same, throws herself around as well, and has tantrums

I didnt even think of separation anxiety, we are together all day everyday, can this still occur??

I have noticed a difference in dd1's behaviour when she was/is cutting her molars. Thank god we've only got two more to go and then we are done with teething. Your dd's behaviour could also be due to the huge development stage she's going through. You said she's almost walking. This is a huge jump for their little brains and she might be acting out her frustration too. Is it just normal tantrums or do you think there could be more to it ie ear infection or something like that? If you are really worried it might be worth takin her to the doc for a general check up. My dd's worst tantrums are always just before she comes down with something. The good news is it will pass. Sending you big hugs for now though :)

Thanks NikW, I dont think she is coming down with anything I really do think it is a mix of teething and like you said developmental stages, trust me I have considered everything even laid awake at night thinking what I can eliminate so to speak. She does tug on her ears a little but I am assuming thats all part of teething.
I snuck a look into her mouth tonight and I can see one molar has popped through but the others are all lurking. Also I think that she might be getting an eye tooth which cant be nice either.