After working in the same trade your entire life, and being burdened with the spirit of the family business, you can't help but gain some pride and get defensive about what you do. And after competing with your countless identical sisters for what feels like eternity, you also can't help feeling like the constant grind to do the same thing - but better! - was wearing you down.
So Anna settled down. Somewhat. Of course she wasn't going to give up running a store, don't be ridiculous. Customer service and haggling for profit were her life. No, she didn't need a total change in career, just a little broadening of her perspective.
Princess Corrin's army always needed something. Between all her officers, her soldiers, her workers, and all the attached families, there was something she could do for each of them every day.
Of course one could still find quality weapons, magical or otherwise, by visiting Anna's establishment, treasures she managed to acquire on her regular trips outside the confines of the magical encampment, but that wasn't all she had to offer.
After all, besides goods, people also tended to pay for services. Some just needed advice, be it financial or personal, others were looking for simple repairs.
And a surprisingly large amount of clients were just looking to get themselves nicely and safely trussed up for one reason or another. Every couple of days, somebody came to Anna with an excuse or bizarre problem to which they decided the solution was to be helpless for a while. Some were far more open, ready to admit they just needed somebody to indulge their fantasy for a while.
It happened often enough, that Anna got surprisingly good at it. She even began amassing a small collection of tools for this express purpose. And despite the lack of advertisement on her part, whispers of her most unique services spread across the castle grounds like a wildfire.
Clients who came to her good expect efficiency, safety, and, most importantly, confidentiality. No ledgers, no records, just a single contract which the client could dispose of in whatever way they wanted when the bill was paid and the service provided.
Of course, in this unique position, Anna began to learn some curious secrets about people, even the Princess' trusted officers. But all that was part of the job. Her lips were sealed. Almost as tight as those of her clients.