@minisnowballs our school sends out a pack of information in June to new parents but most of the information is available in the new parents section of the school website. If you call admissions or the school office and explain you’d like to get the information early they should help.
Our school has a uniform shop and you can book an appointment to be fitted, sports kit, tuck box, sports bag, hockey sticks etc all in the shop, nametapes ordered and sewn in (extra charge but worth it). Also could all be done online and kit put in boarding house for start of term if you like.
You will be given a list of required stuff, mattress comforter (not essential but nice), duvet with at least 2 sets of covers, 2 towels with loops for hanging (name taped) etc. wash bag, pjs, common sense stuff. Our school the girls all change into home clothes after lessons, baggy jeans, baggy sweatshirts, jogging pants. Games kit is usually sent to laundry rather than worn in prep but really no one cares and it’s just to be comfortable.
Periods, my DDs friends generally use tampons. My DD uses period pants but comes home every Saturday night after games (back in school Sunday evening) and I deal with them here. Once used they go in those plastic scented bags you get in supermarkets for disposing of sanitary towels so they aren’t smelly in her room. As they have to be rinsed in cold water and then washed in a cold cycle and air dried I think it’s too much to expect of the school. My DD is also very private and prefers me to do it at home. We are probably very unusual in that I only have one D and am a SAHM so I am happy to help with this and have the time. The simplest solution would be to try out tampons in the summer holidays I guess.
Don’t worry too much about being a new girl. Every year girls leave (parents divorce, parents change job/country, run out of money, don’t like the school, are asked to leave) and new girls step in. Also I cannot over emphasise how busy children are at boarding school. It is a long and packed day and your DD will be tired more than anything. I know a music scholar and she is constantly rehearsing, up and down the country in concerts, in school concerts.
Hope this helps. I didn’t go to boarding school but have put 3 children through (2 at Uni now).