How do you stop a paterdale terrier sleep under beds at night? What would you suggest to buy to make her sleep in a basket?

The easiest and cheapest way is to have her basket in a room where there aren't any beds! However if you particularly want her in your room I suggest you buy a crate, put her basket in that, cover the crate with a blanket to make it into a nice dark secure den and start gradually training her to settle in there.