Are the looser stools staying in the toilet area? I mean if it were cecals she would eat them up and you would hardly notice, considering you have had her for 2 years now. However it is likely it is just cecals, but I wouldn’t want to rule it out getting this looked at too. Is she getting enough hay? What sort do you give her? She may have Stasis, it can give them liquidy or jell-like caecotropes, so she needs to be getting enough hay, pref timothy to help with this.
It could be that there is a problem with the yellow crusty discharge around her nose, it may just be a cold/upper respiratory infection. Check her eyes are not watery too. Are there any lumps around her nose? Could be an abscess….maybe.
I sympathise with you about the vet, as soon as you can, give them a call and describe everything. Hopefully it’s nothing to worry about, but it’s difficult to tell sometimes, especially if she is still energetic and her appetite is okay!