I did the Gacha Image that has her on it. You have to do 5 summons on that gate, which will then open up ANOTHER gate with its own image for the "Frosty Summon Gate" with the limited 17 unit pool. She is available from that gate you need to do 5 pulls. It's where I pulled her from.
In all honestly, I say do 5 pulls, scroll over to the Frost Summon Gate and do one more pool and call it there. Either you're getting it quick or you'll be dumping a lot of gems.
edit: Do the Gate that says "SPECIAL SUMMON". Once you have done five summons there, you can scroll left/right to find ANOTHER gate for the Frosty Summon. It's weird.
edit edit: Elgift in your presents box is a Destroyer's Authority Lv.2 - 15% to max Hp and attack
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