Dry Itchy skin

Recently, for the past few weeks, sky has been itching more than usual. She has a few bald patches where she is scratching and behind her ear is scabby. Ive noticed dandruff and she has dry skin. She has been flea treated.
Her last bath was last weekend as she got dirty. we bath her about once every 2 months ish. The shampoo is the cheapest on from PAH. Her food is wainwrights wet and dry and has the occasional carrot/boiled egg and treats from PAH. Any ideas??

It could be the shampoo you are using dosnt suit her and it is stripping the naturals oils from her coat. Try just rinsing her with warm water without the shampoo a few times and see how it goes.