Unknown to me before I first used the SSB Link amiibo, only the first time you use the amiibo will spawn Epona for you.
So I used my amiibo for the first time and got Epona. Thinking "Well, I don't need her right now. I can get her back later" I fast travelled somewhere else without registering her at a stable.
Now I know that she will never spawn again from that amiibo, so how can I get Epona back? Will she be at the place where I left here? Is she a wild horse now or did she despawn? Can I use a different SSB Link amiibo to get her back?
Edit: This question is not a duplicate of What are the requirements for unlocking Epona?
The difference: I got Epona on the first use and I left her alive, but unregistered at some place I do not remember exactly. I just want to know if I can still find her there, theoretically.
Best Answer
I'm the one who asked What are the requirements for unlocking Epona?, and I think I may have a solution. I'm posting it here since my question already has a fitting answer, considering how it was worded. Of course my situation wasn't quite the same since Epona did not spawn the first time I used the amiibo, but maybe it'll work for you as well.
As discovered by user SkipReplay in this thread, there seems to be a much higher chance of getting Epona to (re)spawn if you use other amiibos in-between attempts. Just load your save (wait until the next day if you've already tried using the Link amiibo) and go through as many amiibos as you can, then use Link last. Of course you need a couple of other amiibos to do this, but it doesn't seem like the required amount is very high (I scanned 7 other amiibos, fewer than that could be enough as well).
Not sure why this works, but for at least two people (SkipReplay and myself) it worked on the first try.