depending on age, contralateral range etc 61 degrees might not be too bad? if so its the active movement thats the problem not the passive so she should be working on strengthening particularly in the range that she is weakest ie past 45 degrees of extension. use isometrics in her weak range. active assisted through full range. maybe consider e-stim to help her achieve through range active (assisted) movement.
btw junior physiotherapist, hello! that green writing is really difficult to read. maybe you would consider another colour?!