Hi and welcome
Is your girl still eating and drinking? If yes, then the breathing has not detoriated so much that the need to breathe is taking priority before drinking and only thirdly eating. What you are likely hearing is some crackly/raspy breathing in or into
the bronchia and a respiratory infection. With a little luck she will keep until Monday on this level. Ideally crackly or raspy breathing should be seen within a day or latest two if possible.
Please switch to monitoring the weight with your kitchen scales first thing in the morning so you can step in with syringe feeding and watering promptly if (and only if) needed.
Our syringe feeding guide contains all the details from weight monitoring, and how to compute any necessary support to the correct level as well as improvising and feeding tips for an emergency.
All About Syringe Feeding and Medicating Guinea Pigs with Videos and Pictures
If your girl has lost her appetite altogther, has a clicking lung or laboured breathing and is becoming apathetic, then you are looking at an out of hour emergency over weekends or evenings. The sooner she gets an antibiotic with potential pneumonia, the better.
In this case, round the clock feeding care is crucial, even if it is a battle.
Emergency and Crisis Care as well as Bridging Care until a Vet Appointment
Please be aware that you cannot monitor the hay intake by eye (it makes over three quarters of what a piggy is eating in a day; for that you need some kitchen scales; cheap ones from a supermarket are perfectly OK for weigh monitoring at home. Respiratory sounds can be rather alarming but whether your piggy is still eating normally, less or not at all is in some ways a better guideline as to whether you are dealing with an emergency or not.
I hope that this helps you? All the best. Weekend illnesses can unfortunately really panic you.