The above is what she sounds like. Although my 6mo kitten doesn't bite me.
She does it with a little mouse toy. She carries it everywhere with her. it's especially annoying when she brings in on to my bed at night and starts crying. Sometimes her cries are mingled with trills. Sometimes they are really high pitched as if she is in pain.
Someone told me it might be a sign she's becoming sexually mature and is feeling the urge to have her own kittens ... 
Should i book her in to be spayed?
It was always my intention to have it done, but not as a matter of urgency. She is an indoor cat along with her brother (who was neutered months ago). There has been no spraying and no attempts of mounting as of yet.