她忍不住想妹妹或许有点儿失望，她想起当时对待正在为演奏作准备的妹妹，她

Her sister could not help but think that maybe a little disappointed that she thought her sister was being treated in preparation for the play, she might very nervous, but at the time she focused on doing their own thing, and did not notice other people's feelings, and my sister was perhaps very lonely and very nervous, she did not encourage her sister to comfort at the right time, really not a good sister.

She couldn't help but think that her sister might be a little disappointed, she thought of the time to prepare for the performance of the sister, she may be nervous, but at that time she was focused on doing their own things, did not notice the mood of others, sister may be very lonely and nervous, she did not encourage comfort sister at the right time, really not a good sister.

She couldn't help thinking that her sister might be a little disappointed. She remembered that she was probably nervous about her sister who was preparing for playing, but at that time she focused on doing her own things and didn't pay attention to other people's feelings. Her sister might be lonely and nervous at that time. She didn't encourage and comfort her sister at the right time. She was really not a good sister.