He never made her straight, it was never said she was to play a lesbian - she thought she was in love with Rhona, the 5 second kiss made her realise she was over Rhona.
She was always straight she just fancied rhona, why are you so stupid
Vanessa is not straight, she is bi-sexual, the same as she always has been.
When she first came on the show she said she was BI.
UK
Bit confusing i think