Why are you trying the Matriarch fight as level 2, even?
I'm not sure I understand you're question here. As the player, you have no idea how tough any new encounter will be. You don't even know if there even will be an encounter?? The first thing I found in my game was find the druid grove, and they told me to kill the Goblins, then in the first part of the Goblin camp there was a water well which leads you to an underground cave with the Matriarch spider.
I must have missed the sign on the well that reads, "hey, you're too low level for this fight, come back later!"
My first play through EA I encountered the matriarch pretty quickly as well. One look at its HP from a distance told me to come back later. So yes, there are signs if you pay attention.
