Moder is no different form before, nothing about her has changed. I just killed her again in the last week because I needed more Dragon Tears. The AI tweaks had abilities or damage.
Taking 180 damage from Moder means you weren't properly geared. The attacks have a 200 damage base, 20 off means you only had 20 points of Armor, meaning you weren't even in a set of upgraded Troll Armor. So you were 2 sets behind.
You should be in full upgraded wolf armor. Not that Moder should even ever hit you. When she is in the air you should be prioritizing dodging and stay the hell away form the ice she forms. When she is on the ground a simple pit between her and you and you can rain arrows freely.
You shouldn't be using obsidian arrows unless you run completely out of poison and fire arrows, and you should be using the Draugr Fang bow for added poison on top.
You should of also stopped and geared up better after dying a couple times instead of doing the same thing over and over again and expecting different results.
That's Valheim, you get punished for not learning from your mistakes. Now you've dug yourself in a massive hole by losing your stats. Fully gear up this time, bring pleny of potions and play safe.