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I am so sorry your fur baby is not feeling well and you have not received an answer. I just signed on, saw your question and have responded immediately.
Since your cat is female this is not as serious as if we were treating a male kitty.
It sounds like she has a UTI or cystitis.
Many times this is caused by a dry food diet:
Of course she could have stones or crystals. Give her 3 drops of cranberry juice every day (by dropper) to lower the PH of her urine and stop the burning sensation.
Drain the water from a can of tuna and let her lap it up for hydration
It is safe to wait till her vet comes in this morning.
Please let me know how she is doing .
I am sorry you had to wait.