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If she is producing a red discharge is is much more likely to be a womb infection than a Urine infection. A urine infection usually shows as blood stained urine in the wet corner and hunching as well as general unwell appearance.
If there is discharge and staining and sometimes an unpleasant odour it may be a womb infection or something going on in the reproductive tract. Is she drinking more? Does she seem bloated or swollen at all? Maybe best to have her re- examined and further checks like a scan to see if anything is going on inside. Hope she can be helped x