Not feeding enough
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Trust your baby 😊 as long as she is happy and has wet nappies there shouldn’t be a problem. Remember that even you probably have days when you are less hungry. It’s normal.
Echoing the above, continue to feed on demand x
As above have all said, trust her but keep an eye on her output. It might be that she is coming down with something, some babies won't feed when poorly. Here's some information that might be helpful https://laleche.org.uk/nursing-strikes/
Sometimes when babies get older they don’t take as long at the breast. They get more effective at drawing milk out so they can get the same amount of milk in a shorter time. So that might be why? Keep an eye on her wet and dirty nappies and if she’s getting enough, she’s probably just getting more effective at feeding.
Maybe she is not hungry? Remember that babies know how much calories they need and they do catch up if they don't eat enough one day. What I found is that my LO feeds better now so the feeds became shorter which we first seemed odd but she is still gaining weight at her regular pace