She has a PAYG oyster card so I don't think it'll be effected

Hello! My sister accidentally took my 16+ photo-card today. She was caught by the bus inspectors. She said she accidentally took it because we both had the same oyster cover and few minutes later they called me to ask and I said she probably took it by accident. My question is, will my chances of getting another 16+ be affected? some say i'll have to do voluntary work to 'earn' it back or i'll be suspended for 3 months! It's not my fault because I was sleeping so I didn't know she took it but I can't say that obviously because she didn't mean to take it in the first place and that'll get her in more trouble. Please let me know. Thank you.