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Try Goldwell Colorance. I put it in my hair that hasn't been chemically treated and it hasn't washed out in over 4 months. Also, it makes your hair soft and shiny. But if that fails then use a...

I suggest you get some extensions. Extensions are some what thin looking though so get your bob thinned out so that it will blend in with the extensions and look natural.
I also heard that drinking...

If you use the right one it should wash out. But I'm telling you right now don't use a product called Goldwell Colorance. I used it on my non-chemically treated hair and it hasn't washed out yet....

Um, you're weight is perfect.

At least one month. You don't want to overwhelm your hair with too many harsh chemicals

Use laundry detergent when you wash your hair. The texture should wipe the colour off. But don't get it on your roots and use very little

Get china doll bangs and wear lots of makeup.
Then you'll look cool and mature :D