Might have messed up a bit, help (3e)

So, I've never really been a GM for more than one person games and I only recently went into the whole tabletop game world, so I tried running a game for my little sister (who loves the Exalted setting about as much as I do) both as GM practice for me and roleplay practice for her. Needless to say, she learned incredibly fast with the stunt system.

So basically she had summoned a demon to spy on Kamthahar Dragon Blooded dynasts, implanted a dream using a stolen dress from one of them that implied a full invasion to Ysyr would end in failure, then went ahead to steal sorcerous materials, a simple artifact and food from them (besides freeing a captive, important slave) Cue her getting caught and almost not surviving the trip, and the subsequent Dragon Blooded invasion to Ysyr to recover their artifact and honor.

Which was mostly fine until she began summoning Erymanthus demons every day (she was informed that the invasion would happen in a month) and never failed a single control roll, amassing a Size 2 army of them, then lead the army against the DB army and utterly crushed them (Erymanthus + Death of Obsidian Butterflies + winning the strategy roll...) Now there's a few lifetime's worth of artifacts lying around, barely any DB escaped alive if any did, and she won a battle I had prepared for her to lose (and be saved at the last moment). Any way I can bullshit my way out of giving her a shitton of artifacts or do I have to call the Siddies to clean up the mess? Probably a rookie mistake but I'll live with it.