Baby refusing breast

My 5 week old has been EBF since birth and has no issues with latching. She's been gaining weight well. But the last couple days she will feed for a minute or two and then start fussing and crying and refusing the breast. I don't have an overactive let down, and it's not reflux or gas. I haven't eaten anything different. Has anyone else experienced this? I know she's still hungry but she refuses to feed properly and cries until she falls asleep. The only thing I can really think of is that my milk supply is low or the flow is slow and she's getting frustrated, but I'm not sure what to do if that is the case... she won't take a bottle either so I can't supplement.

Thanks for any advice!