"She likes those boots."
Translation:Ela gosta daquelas botas.
Destas = these (near me) Dessas= those (near you). Daquelas = those (near she)
So, "ela gosta dessas botas" could be right, if you were speaking to someone that wears nice boots, but talking about someone else.
But don't worry, in everyday use people don't care about that detail level.