jazana Allah wa eyakum brothers and sisters.
concerning the evidence that ayesha ra or any other female companion was circumcised?
the evidence is that all arabs used to do it, circumcision was a common thing between them, it was a disgrace between them if a woman did not have circumcision.
and islam didn't forbid them from circumcising but stated that it is an act of rightious Fitra.
it is also good to mention that this process should be done with some regulations for it to beneficial and for preventing any injury.
and as for the second question
why did it die out?
well, it did not die out but there are many islamic laws which are being attacked by both some muslims and non-muslims and this is a normal thing to happen.
there will be always a struggle between right and wrong like what happened with the majority (if not all) of the prophets with their nations.
but the more you learn about the islamic laws the more you will know that there are many wrong acts which are common between muslims, so the act of ignorant muslims is not a good indication of the islamic laws.
thats why we need to learn from the sources and from the preserved texts which are Quran & Sunna.
if you observe the acts of muslims, you will find many of them swear by the prophet (they say "wennaby") wich means by the prophet or for his sake and this is totaly forbidden by the shariaa and the prophet himself said that " who ever swears by other than Allah then he has committed a sort of shirk (a minor polytheism)"
finally concerning the circumcision here are some good fatwas:
Circumcision of girls and some doctors’ criticism thereof
http://islamqa.com/index.php?ref=60314&ln=eng&txt=
the medical benefit of girl’s circumcision
http://islamqa.com/index.php?ln=eng&ds=qa&lv=browse&QR=45528
concerning the evidence that ayesha ra or any other female companion was circumcised?
the evidence is that all arabs used to do it, circumcision was a common thing between them, it was a disgrace between them if a woman did not have circumcision.
and islam didn't forbid them from circumcising but stated that it is an act of rightious Fitra.
it is also good to mention that this process should be done with some regulations for it to beneficial and for preventing any injury.
and as for the second question
why did it die out?
well, it did not die out but there are many islamic laws which are being attacked by both some muslims and non-muslims and this is a normal thing to happen.
there will be always a struggle between right and wrong like what happened with the majority (if not all) of the prophets with their nations.
but the more you learn about the islamic laws the more you will know that there are many wrong acts which are common between muslims, so the act of ignorant muslims is not a good indication of the islamic laws.
thats why we need to learn from the sources and from the preserved texts which are Quran & Sunna.
if you observe the acts of muslims, you will find many of them swear by the prophet (they say "wennaby") wich means by the prophet or for his sake and this is totaly forbidden by the shariaa and the prophet himself said that " who ever swears by other than Allah then he has committed a sort of shirk (a minor polytheism)"
finally concerning the circumcision here are some good fatwas:
Circumcision of girls and some doctors’ criticism thereof
http://islamqa.com/index.php?ref=60314&ln=eng&txt=
the medical benefit of girl’s circumcision
http://islamqa.com/index.php?ln=eng&ds=qa&lv=browse&QR=45528