I second what Snowy Love said.

When we went through breast refusal the advice given to me (probably worded better lol) was try not to push it. She wont starve herself, if she's really hungry/ thirsty she'll drink. It'll just stress you and her out and make it worse/ create a negative association with feeding. Almost as soon as I relaxed and stopped worrying about it DS went back to feeding really well.
Like Snowy Love has said just keep an eye on the nappies. It's perfectly normal for a bub to go a few days without a poo. So long as she's not constipated and has plenty of wet nappies (6-8 a day, I think) then it's ok.

HTH and Bub is back to it in no time