I don't understand Shievonne
 

Is it just me, or does anyone else find it hard to understand what Shievonne is talking about when she is in full flow? She waves her hands around so much and seems to go from one topic to another so rapidly that I can't follow what she is saying at all.

It's her accent. She doesn't have one of those weird accents where you have Cockney mixed with Jamaican and slang - it's like a pure Cockney accent and the fact that she talks quickly and throws in all that ghetto slang doesn't help either.

Nope, not just you.

Im mesmerised by her hand movements and i dont take in a single word she barks. Even the subtitle people give up when she talks and just end up typing a couple of random clichés, hoping they get lucky.

It's not just you!

Thank you for reassuring me, as I was starting to worry about my hearing:)

She looks like a chicken without a head.

I don't think it is her accent which isn't very strong.
You are right about the rest, especially the amazing hand signals. Is it semaphore?

Nothing to do with being a Cockney IMO, I'm married to one and their accent is perfectly intelligible. She talks too fast and many of the words are mis-pronounced; that's probably why you can't make it out. I wouldn't worry about it, as long as you can get the general gist.