Bottle feeding if she takes it is fine, if she's not suckling properly you may need to tube. Ideally 4-5 times a day at this age, and amount depends how full she feels. 100ml at a time is likely the maximum I would give as that small, possibly even 60ml, but you should get an idea how full she is by feeling her tummy, if swollen tight or she regurgitates any milk, it's too much, if she's still hollow, you could give more.
Persevere with trying to get her to latch onto mum as well, providing there's milk there to encourage her or you'll not get far. Sometimes squirting a bit of mums milk into her mouth can help, otherwise minimal restraint to put her in the right place will reduce her wriggling. Sometimes if lambs are small, a bit premature or had a difficult birth causing lack of oxygen, they can show a "dopiness" which can take a few days to overcome. Make sure she stays warm and is fed at least 4 times a day and patience should pull you through.