Help has anyone read this book

Hi — I’m trying to find a romantasy / shifter romance I read some time ago. Key scenes I remember:

The heroine is effectively a slave to an alpha male.

The alpha keeps a pet tiger and forces (or orders) the heroine to train inside a cage with the tiger.

They return to the heroine’s old pack for a dinner/banquet event where a fight breaks out. During the attack she shifts into a white wolf and runs through deep snow at incredible speed.

The enemies (or other characters) call her something like “White Death” (or give her a similar nickname).

The alpha possesses a special glowing stone that—when it lights up—calls or alerts other wolves in the area. I think it was indie / self-pub or a webserial (GoodNovel/WebNovel/Wattpad/RoyalRoad) rather than a big-publisher title. I don’t remember character names. Any leads appreciated!