I just had to answer you for this. YES, that is quite common. Scientifically and spiritually. Our memories can be recalled at any time and many times the stronger the bond the more real the "echos" of past sounds are. And it's perfectly normal. On a more profound level, she is telling you she's ok. She is there with you now, and you mgiht just see her in different forms. I truly believe that. I am very much here for you and if I can ever support you, please send me a PM.
For a few weeks after I lost Jimmy my eyes played tricks on me. I would see him curled up on a bed or the sofa when a closer look proved it to be something like my son's white t-shirt and black socks screwed up in a heap.
