Food :
If you roll a lot to evade attacks , so stamina consuming : serpent stew , eyescream and onion soup
If you wants some more hp : serpent stew , wolf skever and eyescream

Get full silver gear and use obsidian/needle arrows or poison arrows
If you try meele ( i dont ) maybe silver shield and iron mace or more risky fang spear, silver type weapons are not effective vs that dragon , only the bow

Rested buff at full lvl , tasty me/asd for stam regenerations and health and stamina potions

Sausages, wolf skever and onion soup was enough. Didn't roll at all. walked away from those shard attacks and kept hitting it with bow. Conserving stamina for quick short sprint if needed. Used max level wolf armor and max level draugur bow. 20 minutes rested.
Also used a frost resistance potion. Can easily tank few of those shard attacks. Got few medium stamina and hp potions with me but did not use them.

I used serpent stew, wolf skewer and eyescream, it will be a little more of both stats.

Post - H&H wasn't really any different than before. I used sausage, black soup, eyescream. Draugr bow with needle/obsidian arrows, and a silver sword. (She ignores spirit damage but it still did well enough.)

Use terrain for cover while shooting, when she lands run up and melee trying to stay behind her.