I gifted my sister $100 worth of ETH last year when it was hovering around $2k. She also likes to invest on Bitcoin but wants to go all-in. But I told her not to because its very risky if she will convert all of her savings into Bitcoin.
Maybe your sister should be teaching you..? She might tell you to fuck off with the Ethereum crap.. she wants real money.. I.e. bitcoin.
She knows that investing in BTC its like investing in stocks but in a decentralized and easy way. I only educated her about risk management since she is not interested into technical stuff.
You don't necessarily need to know all of the technical stuff, but at least, if she gets started with getting exposure to bitcoin, the once her bitcoin stash gets to a certain level, then maybe move most of her value to some kind of a hardware wallet.
Risk management is a good thing for all of us to learn in regards to figuring out reasonable and prudent ways to get into bitcoin, and even if we are employing reasonable and prudent manners to get it, we still can figure out ways in which we can be somewhat aggressive in our BTC investment too.. without getting overly aggressive that would cause us to panic if the BTC price goes down, rather than up or staying flat for a while.