Rian's been digging through the numerous scrolls scattered throughout the empty compound, gradually carrying them back to the main house and building up a library. She needs the information to become strong, even if it feels weird and heavy to be sorting through the belongings of the dead. (She's not stealing from the dead. She's not. The Hokage said this is all legally hers.)
She finds a summoning scroll, which grabs her interest. Summons can be powerful, and she's always wanted the Uchiha cat summons - maybe this is it! She takes the scroll to a training clearing outside the compound, just in case she gets something big, and reads through it with her sharingan active. She doesn't recognize all the words, but the technique itself has the furigana pronunciation written next to the kanji, so she can sound it out.
It's mostly theory, but the handsigns seem pretty straightforward...
She cuts her palm shallowly, flashes through the signs, then slams her open, bloody palm on the ground, channeling as much chakra as she can.