Looking for build advice level 16

Yeah, I know that's low level. I started a Ranger yesterday and have been dumping all of my passive skills into offensive abilities (yes, I knew it wasn't smart, even as I was doing it). It worked pretty good for me though...until...I got Merveil. She doesn't just kill me, she destroys me. I can't move away from her, I end up frozen...if I do manage to move away, the second I turn to fire she chains whatever that 4 bolt attack of hers is and burns me down. If I get in melee range she beats the crap out of me.

So, getting kinda frustrated.

they already nerfed her hehe, be glad you dont have to fight the prenerf version.
To your problem, you just have to get your cold resistance up (everthing over 65% should be enough). To achieve that you can sell for example 1 iron ring with a blue skill gem to get a cold res ring (if you have the orbs you could use a transmutation orb to make it magic and roll it with alteration obs to get additional cold resistance mod).
Second point that will make the fight easier is to use puncture or poison arrow, the dot will prevent her energy shield.
Third pointer is to use the walls to kite her and prevent her to cold snap/ice spear you (plus the dot you can basically hit and run till she dies).

Another thing that can help is to party! oh yeah :P