Okkkkkkkkkk, since it sounds like you have a build ill skip that.
First a quick over view:
L56 dex birds are very fragile
You need decent Internet to use a bird... My new Internet speed keeps my ping in 400-900 so... Yeah bird sucks for me now. Anyways moving on.
You need to either nuke or kite them until they use mana shield then nuke.
For a nice hard quick nuke break, root, blast, then repulse.
Something to note repulse does second highest amount of damage. Now against a charm Mage, your best defense is offense then kite. Use blind first when kiting, this makes you more likely to dodge and decreases there hit%.

If you need more help or unclear on what I said pm me or post here I might check.