First, I have to say that I am glad to see that you are planning to have her seen today. Furthermore, if possible, I would advise doing so urgently. White gums are a serious worry here for Cleopatra and an indication that she is either anemic (low blood volume) or struggling to get oxygen.
Since you didn't mention any struggles for breath, I would but concerns like heart or lung disease to the bottom of my concerns and would be especially worried about anemia. This could certainly cause weakness and disorientation. And that could cause her to cry with disorientation due to a lack of oxygen to her brain instead of pain. But if she could have eaten anything that has damaged her gut enough to cause internal bleeding (or has internal bleeding for any other reason), these too could cause her to cry along with these other signs.
Further to this, in cats her age, we can also see chronic anemia and nausea/vomiting both related to organ issues like kidney
failure. In these cases, we can also have crying due to confusion because of secondary high blood pressure caused by the kidney disease. So, this too could cause all we are seeing for her.
Overall, we do worry when cats go off their food
, but in Cleopatra's case I do think this is a side issue. Those white gums are a major red flag of a bigger problem. Therefore, we'd be best to get her seen urgently today, have her vet examine her +/- take a blood sample. Depending on their findings, they can advise you to what is causing her signs, whether it can be treated, and get her comfortable as quickly as possible. And if we can address those more serious issues for her, then I would expect her appetite to improve as we do so.
Please take care,