Thanks to all for your replies.
The cat is in perfectly good health. I eventually solved the problem by spraying a little water on her every time she started howling, if she persisted I gave her some "time out" on the balcony. Now everything seems back to normal, although she is still more...
My husband and I have recently moved to Romania from Egypt. We are both English, but move around the globe a lot with my husband's work.
While in Egypt, we were adopted by a delighful female street cat. We took her in, fed her well. We lived in an appartment on the 3rd floor of a building...