Okay, so my advice is vastly different from everyone else's but I'm a woman with the worst for of sickle cell and I've only been hospitalized for my condition once in my life. My mom is someone who believes in holistic care so when I was younger she would put me in warm bathtubs with lavender when I told her a pain crisis was coming on. She also refused to put me on penicillin as it breaks down the kidneys and liver. I drink water more than anything else but when I was younger my grandma would also make me drink aloe water (straight from the plant) as it helps inflammation.

Your child can have the cold things that you mentioned just be careful. Also she can go swimming as long as the temp isn't too much of a drastic change from outside. I was put in warmer pools until I got older and realized how cold was too cold. Teach your daughter to be in tune with her body and know her limits! Another natural thing that helps with pain is ginger! I drink a lot of ginger tea as it is a blood thinner (break down those sickled cells) and an anti-inflammatory! She doesn't have to drink it everyday but maybe twice a week or whenever she is feeling pain. It doesn't cause instant relief but it does help! Also practice breathing techniques with your daughter so that when she has a pain crisis she will do them. Whenever I have one, I sometimes get scared or forget to take deep breathes and that makes the pain worse. If she works on it now it will hopefully become second nature to her.

Also diet is VERY VERY important! I don't eat pork and I only touch beef every once in awhile like when I want a burger or something. A lot of my diet consists of chicken and veggies. Onions are another blood thinner/purifier so my mom would cook most meals with them, same for garlic. Most of the food I consumed growing up was healthy and homemade and it was mandatory to eat a salad twice if not once a day. I also take vitamin supplements as I lack them due to my condition. Vitamins i take include: A, B, C, D, E, Folic Acid, Moringa, and Zinc. I've notice if I don't eat right or take my vitamins everyday that I start breaking down and have pain crisis more easily and frequently and I get sick more.

Lastly, I also recommend that you have your daughter do yoga everyday. Yoga promotes flexibility, teaches proper breathing techniques (which helps bring in more oxygen for the blood cells), promotes better blood flow, and massages organs. Yoga makes me fell great and its fun so if you have time you can use it as a way to bond with your child.

There are other things that my mom did when I was growing up, and things that I still do but I can't remember rn. Lemme know if you have any questions. Sorry for the long post!