For your real question: just give it to her.
You already like the concept, you already want to do that, you already have the mechanical and story parts, and you already know there isn’t any magical-places system to fit this in. There is no need to create or discover such a system, then use it to back into an answer you already have.
For your general ...
You can create a permanent teleportation circle by casting this spell in the same location every day for one year. You need not use the circle to teleport when you cast the spell in this way.
Casting this spell on the same spot every day for a year makes this effect permanent.
5e seems to suggest that just ...
Bottom line up-front, the guidelines we have available don’t really suggest that you can do this just the way you describe, and personally if I were your DM I wouldn’t let you in most cases, certainly not with weapons anyway. But that’s just because armor and weapons are a little special—you can totally do this with other types of items.
Specifically, the ...
The rules don't specifically cover this use of limited wish, but they suggest that a reasonable DM should allow this.
According to the rules on Creating Magic Items:
These prerequisites must be met for the item to be created. Most of the time, they take the form of spells that must be known by the item’s creator (although access through another magic ...
Yes, this works.
Yes, using wish for this works - and yes, you don't need to "have" the spell for it to work if you find another source to cast it.
The description of wish states:
A wish can produce any one of the following effects:
Create a magic item, or add to the powers of an existing magic item
Material Component: ...
The amount to buy half-plate is not the amount it costs to craft half plate—the smith needs to sell for more than it costs to make. Crafting half-plate would normally cost (per PHB page 187) half its list price: 375gp.
Your mithral version, at 500gp, therefore costs more to craft.
Also note that, as always, crafting magic items is an optional ...
This is covered by the last sentence of the feat's text, which says:
The GM decides whether you can ignore a requirement.
Although the rest of the text identifies several cases that either explicitly are or are not covered by the Craft Anything feat's benefits, all other cases are subject to your GM's decision. Since having a formula is a requirement for ...
There are no rules for creating lower HD Constructs or altering the book ones except Modifications.
However, you could build them from the ground up using the rules for Building New Constructs. This section relies heavily on GM oversight for appropriate benefits, but references Monster Creation Rules as a baseline.
This is an example of what a 1HD Flesh ...
A spell prerequisite may be provided by a character who has prepared the spell (or who knows the spell, in the case of a sorcerer or bard), or through the use of a spell completion or spell trigger magic item or a spell-like ability that produces the desired spell effect. For each day that passes in the creation process, the creator must expend one spell ...