if she is intact, i would get her spayed ASAP - intact Fs come into cycle every 21 to 28 days, from the time that days grow longer than nights, until in late fall, nights are again longer than daytime...
which is a real PITA to deal with, as Fs in heat will call, spray, roll, snarl at their buddies, scratch items as a form of advertising, and try desperately to escape. EVERY time the door opens, they may run for it! this gets really OLD...

i was ready to da*-near throttle my father, b/c we had my older-sisters Siamese living with us - she went into + out of heat 4 times in just over 3-mos, yowling at 3-am, pounding down the stairs screeching, rolling all over the floor calling, waking me up by jumping on me in the middle of the night, and ThAT will scare the $#%@! outta U, let me tell ya, having a crying lump with claws JUMP on U in the dark!!, jaysus, my heart about jumped outta my throat, yipes...

anyway, i would GLADLY have paid for her desex!
it was awful, and she finally leaped OUT a second-story window THRU the closed SCREEN, to go and meet her paramour - she had FOUR litters of SIX kittens, all by the same M-cat, over a 4-year period. :---(/ that is TWO DOZEN lookalike brown tabbies, all with rich ticked brown-tabby + sharp black stripes, lovely faces, and a differing number of white toes or short sox... the only way to tell them apart!
they all had buff tummies, too. *sigh*

i would cheerfully have desexed him, too, if i had ever seen him or found out who owned him - but this was in the 1960s in a rural farming county. Heaven knows how far she went to find her darling, yeesh... (eye roll)
get her spayed - she will live longer, and no daring leaps from windows or sprints out of doors!

cheers,
--- terry

terry pride, APDT-Aus, apdt#1827, CVA, IPDTA, TDF