I def feel that you should not be blamed, no nurse in fact. However it is the oncoming nurses responsibility to chart what she saw happen & how she assisted the fall, & any or all interventions she performed on the patient because she assumed care of the patient and witnessed the fall. Now she/they may say you didn't have a chair alarm but so long as you tried to get one and made the charge nurse aware then you did your part. In addition, your charting (hopefully) reflects any patient teaching you performed to your alert and oriented patient regarding getting up without assistance and that you had the call within reach. Even still I wouldn't stress, no injuries, so you will be fine. You can use this experience as a teaching lesson- be sure to document any teaching done to patient and that maybe next time before change of shift, have patient put back to bed safely with your assistance so you know that your patients are safe.