Does she leave sooner, and be less prepared, in order to get to Nico and help him more quickly? Or does she wait and prepare more, so that she can help him properly when she does go? If Nico has lasted this long, a month, he can last a while longer...
And she's a little scared. She's probably being really stupid about this, actually. Her parents would DEFINITELY tell her not to do it. It could hurt her. Nico is probably gone. It's not her responsibility to help others. (It really, really is, though. SHE'D want someone to come rescue her, and if you don't treat others like you wish to be treated, what are you even doing?)
She doesn't really know why she's doing it anyway despite all the reasons it's a terrible idea... But she definitely is. But just how long can he wait? She starts saving her allowance, doing extra chores for more coins, because she'll need to buy a lot of things to be well-prepared. And she goes to the temples again and sits in on lectures about the founding of Gale Rocks, and everything the colonists needed but didn't have, and all the mistakes they made. What will she need, exploring, going to wherever Nico ended up?
What will she need?
She'll need red: She needs to be strong, skilled, hale. She needs tough clothes to endure the elements, food and water to sustain them in the short term, and a weapon. Too much for immediate use pulls away from longer term needs, though...
She'll need blue: She needs to make use of whatever is at hand. Tools. Carving knife, rain tarp, sewing kit, a light stick and some charged Lumen, maybe other tools. Things to make things with. Maybe books about different kinds of craft? But books are heavy and expensive...
She'll need green: Growth and medicine are both essential. A lot of what the doctors say goes over her head, but healing makes sense to her, and she can learn more. And seeds- She needs as many different kinds of plants as she can get, so SOMETHING she brings will grow wherever Nico is. Crops!
She'll need white: Knowledge. This pretty much just means learning as much as she can, and getting books. Nico liked drawing hexagrams, he's good at Black magic, she thinks. And he kept talking about The Shape of Eternity, that book about enchanting... So she'll buy it, plus some others that might be useful.
She'll need black: The future, the long term. Not just food to eat now, but crops to grow later. Not knowledge now, but things that will be useful in the long term... Nothing really sticks out that she hasn't already thought of, but she tries to imagine building a house in every kind of place she's heard of.
In the ocean? On a mountain? In a desert? How would she do it? What kinds of things would make it harder? Water, cold, food... All the same problems as before.
She writes out her plans on paper, carefully hidden in a sort of journal, and makes and re-makes checklists, and saves up her money, and tells the doctors she wants to learn more about real medicine... Days pass, and she still doesn't feel ready. And days are passing for Nico, too, while she dithers. (Unless he's dead after all. Days are passing for him probably. Hopefully.)