My DD13 has super-thick, wavy, frizzy, long hair. Though we’ve been styling it straight (at her request), we haven’t been very successful. We suspect it might be more wavy than we think or even curly but have no idea what to do with it. I have no experience of curly/wavy hair. She also has scalp psoriasis. Please can you wise mumsnetters advise me on specific inexpensive products I can buy for her that will help create mermaid waves / curls without aggravating her scalp (or even help it)? I’ve checked out various websites for info and am completely overwhelmed at this point. Thank you.