There are loads of prose issues, some of which will be very difficult to fix (such as confusion with Dot and Dotty)
"after finding out that Sandy is alive." Clarify for readers, "after... her mother, Sandy, is alive" DoneMayhemMario
"Dotty's storylines mainly involved around her father devious ways." That doesn't make sense. Done-Dotty's storylines mainly involved around her and her father devious ways.-Better? MayhemMario
"by believing she was suffering form dementia and later trying to poision her, so Nick could get the money from her will." Sentence needs some work, reword please. Done-She assisted Nick in trying to kill her grandmother, Dot, by making her believe she was suffering form dementia and later trying to poision her, so they could get the money from her will. Better? MayhemMario
"Dotty was the result of a one-night stand" That sounds horrible! Reword - she was conceived during a one-night stand or somesuch. Done-Dotty was conceived in a one night stand between Nick and an alcoholic woman named Sandy (Caroline Pegg). -Better? MayhemMario
to her birthday - why is her italicized? DoneMayhemMario
"Dotty was supposed to eleven years old" supposed to be DoneMayhemMario
They called her "angleic"? That doesn't make sense, angelic perhaps? DoneMayhemMario
"said Dotty is one of the youngest, most wicked female soap villains." Needs quotation marks. DoneMayhemMario
General notes
A lot of the "2008–2010" needs going over for sentence structure changes. DoneMayhemMario
Gah this gets confusing... with names like Dot, Dotty and Dorothy. Just do a browser search for "dot" and you'll see what I mean. It gets very difficult to read the prose and is distracting, especially for a newcomer. Make sure you clarify very clearly which is which in the first or second sentence. Done- I've added a line in 'Backstory' saying,'Dotty was named after her grandma, Dorothy or known as Dot. '- Is this better?MayhemMario