I'm sure there are good starter kits out there, but I don't personally have one to recommend. There are a few individual items that I think can be a great place to start! This bruise wheel has all the right colors to do some great bruises and basic zombie makeup. It can be paired with some regular "clown" white makeup, cotton and fake blood for some easy starter wounds/gore. You can add liquid latex as well if there isn't an allergy, though it can be messy!
The YouTuber Glam and Gore has some really good videos that specifically show how to set up a kit or do gore with household items. It may sounds crazy, but I started doing FX makeup as a kid with whatever I could find in my mom's purse (sometimes just lipstick, concealer and ink!).
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Good luck getting her going, it is a very fun hobby! I hope she doesn't scare you by faking injuries like I used to do to my parents!
Try liquid latex? For large effects or attaching bald caps etc
Kangaroos Professional Grade Liquid Latex Makeup, 16 Oz Pint https://www.amazon.com/dp/B011X3C8CK/ref=cm_sw_r_cp_apa_i_OFM9Ab1V9ZARF
Or use spirit gum for smaller things that you need to REALLY stay on longer haha. You will need spirit gum remover as well (a separate product) to take it off safely.
Mehron Spirit Gum & Remover Combo https://www.amazon.com/dp/B0040ZEHPK/ref=cm_sw_r_cp_apa_i_VHM9Ab2HDKE3Y
There are a couple more options but these 2 products are very versatile and can probably accomplish your goals
Hi! So to achieve a natural looking ginger color I first think of temporary hair color sprays. The authentic red color, however is very uncommon in temporary hair sprays and paints because they are usually marketed for crazy costumes (ie. having neon hair). The best option I can think of for you would be a product that is used to cover up grey roots. These can be found anywhere that carry any type of hair product (Target, Walmart, Rite-aid, CVS, etc. the list goes on). There is one in particular that is more ginger than anything that I think would work best for you, made by L'Oreal: "L'Oreal Paris Magic Root Cover Up" in the color "Red". It is available on amazon (and some other websites) too if you're more of an online shopper: https://www.amazon.com/LOreal-Paris-Color-Cover-Packaging/dp/B01DPWDWG8/ref=sr_1_15_s_it?s=beauty&ie=UTF8&qid=1505178151&sr=1-15&keywords=hair%2Bmascara%2Bred&th=1
My friend had been looking for something she could color her eyebrows with, without bleaching and dying, to match her semi-permanent hair color (the ginger color that I believe you are describing). For this she sprayed a bit of the color on a paper towel(sometimes using a sponge) and dabbed it over her naturally dark eyebrows. I also helped her the first time, and recommended that she spray a bit of normal hairspray over the color to avoid any smudging and it worked wonders. It stayed for at least a full 8-10 hours if not more, even through sweat and humidity.
Well I hope this helps your search out a bit, let me know if you have any questions on what I said, or anything else.