my unaltered 1 1/2 yo female gray tabby cat, Pebbles Leanna, has been in constant estrus since Christmas eve of 2018…she is usually in heat 7-10 days. this is the first time she’s been in heat this long. no other physiological or heath problems. she eats, defecates and urinates appropriately. she is the only unaltered cat of 5- one female and 3 males. days are ok but her night time yowling is so loud, my next door neighbors (I live in a single dwelling house) tell me THEY can hear her at night singing the songs of her people. no other problems noted. PLEASE advise!..