Before the era of ninja villages in her earlier Days, Reimu's limited spiritual abilities made her weak, to the point where she was unable to harm enemies directly at all.
But as time went by, Under Her father's Surveillance she developed her abilities, becoming able to use the Yin-Yang Release, special Uchiha Kenjutsu, and her own limited spiritual chakra in order to fight enemies effectively. Eventually she also developed the ability to fly, which she previously relied on her turtle, Hipster Madara+, to do so.
As Time went by Reimu became stronger and stronger, to the point that her father Has entrusted the village to her after his death. At the 18 Remui had life changing experince's that would alter her way as a shinobi for ever. On her 18th Birthday, After marrying her lover, Madara Uchiha, she settled down to become a housewife, raising their sons Hitachi and Gaysuke. Just before her best friend TouTou Uchiha gave birth, she met with her and introduced her youngest son Gaysuke. She agreed with TouTou's hopes that their sons would become best of friends. After Toutou asked whether or not childbirth was painful, Mima the village elder laughed, having found the one thing that Toutou was seemingly afraid of.
During the Nine-Tails' Attack on Konoha,Their older son Hitachi, at 9 years old noted that she and Madara were noticeably absent before the beast struck being that they were on one of their special missions in the family cabin. What they were doing is currently unknown.
During the massacre of the clan when Hitachi confronted her and Madara, she was seen sitting beside her husband. When their son tried to explain himself, she simply told him that she understood before allowing a tearful Hitachi to kill them. This would later prompt Gaysuke to want to avenge her death along with the rest of the clan, or so they thought. In her dying state..she somehow managed to craw out of the distorted house, Making her way to a Nearby cave her Husband often time visited for Days.
Soon After finding an entrance to the demon world in a cave, Reimu was forced to defeat the Guard Ninja Naruto Uzumaki. During their fight, already in a near death state Reimu unlocked the Mangeyko Sharingan which then later enabled her to find a direct route to Hell. Curious, she descended into Hell and fought a master swordsman named Konohamaru. Reimu again prevailed by momentarily burning her opponent with Amaterasu.