Just saw this on her Twitter:

Lost my voice and we have a gig tonight :-( Haven't been on stage for ages too! im really sad:-(
3:16 AM Apr 25th from mobile web

Didn't even know they had a gig tonight! That's such a pity though, what with studio time coming up tomorrow too.

:o I saw this! its so sad! i am sure its ok though, if not she wouldnt be going tomorrow! (fingers crossed)xx

Im sure with some rest she will be fine again, hopefully it isnt anything long term.

She probably lost it using it all shouting at the builder who was using her tiolet :P