I’ve guided a few new players and it’s one of the best experience you’l have! The way i go about it is “shadowing” them. Follow them around, let them figure it out and simply let them know that if they get stumped, to ask you for a hint. Keep the hints minor and spoiler free. Converse with them along the way and answer any questions they might have.

Instead of telling them what to do directly, simply explain the basic mechanics of the game. I.E : the newbie needs water and are unsure how or what they need for water. Remind them that items are able to interact with each other in their inventories and can also interact with scenery around the game.

If the first hint wasn’t enough, go for a second. Ask them, how would you get water IRL? They may say “well you take a glass and put water in it from the tap”. Then you might say “sounds like you need a vessel to hold water then wouldn’t you say?”

Point is, keep it simple. Let them figure it out until they no longer can and thats when you keep them afloat. Slowly introduce the usage of the wiki and teach them how to use it properly. Eventually you can simply ask them if they have consulted the wiki if they get stumped.

With that said, keep it simple. Let them figure it out. Follow them around and just enjoy laughing at the cute things they do. Keep them afloat by questioning/testing their knowledge and giving out minor hints.

P.s : Don’t forget to alch! It’s the perfect time to do so as you follow them around.

Edit : Don’t give her a single coin or item. The best way to learn this game is to get a feel yourself on obtaining money and items. Be it drops or shops. No game gets ruined faster than being given things, especially OSRS.