Tiggeytoes...sounds like when I found my baby Bagpuss in the dumpster when she was 4 weeks old - she was put in there to die. She had conjunctivitus and cat flu and tghe vet wanted to put her to sleep.
I also had to bottle feed, this is how I did it - don't know if it will work for you but it is worth a try......
She was in the kitchen so small and would get lost in the corners of the kitchen. I got some special kitten milk from the pet store and a tiny little bottle and I tried feeding her - the first day she only took a little because she was so ill and I think ready to give up she tookm more the second day and by the 4th and 5th day she could not get enought. I would suggest that you put some milk on the teet and let her smell it and lick it evetually she will take the teet into her mouth and suckle.
I only bottle fed for 1 week then weened her off which took only about 2 days.
Also because Bagpuss was so small I got a really soft peice of material which was also to keep her warm and I left that in the kitchen for her to sleep on - I think she liked that becuse not only are the tiles in there hard but they are also rather cold.
I think when you have such a little one like that who has had a rough start in life a lot of lovin' and cuddles and kisses are needed.
Wish you loads of luck and let us know what happens