Aww, that's stressful talaga! At 4 months kasi, sometimes they go through phases, a few of us noticed our babies suddenly reject the bottle for a few days, tapos okay na ulit, so don't worry too much just yet. Try switching the bottle teat (sometimes they're just picky!), warming the milk slightly, or even let daddy or someone else try feeding her, sometimes babies are weird with their moms lang haha. But if it's been going on for more than a couple of days or she seems fussy or uncomfortable in other ways, best to check with your pedia kasi there could be something else going on like reflux or a sore mouth. Keep me posted, mommy, you got this!