Help w/ my Rogue Erinyes NPC plz!

[Faehlle Cennaire]

Hey all, I need a quick opinion on something I'm working on for a game.

One of my NPC's is a fallen Erinyes who went rogue, was punished and cast off into the wilds to die. She's had her wings clipped (no flight) and has been stripped of her Spell-Like and Summon Baatezu abilities. She still retains her Entangling rope and her True sight, along with any other innate qualities not mentioned above. I'll be choosing new weapons for her as well (along with adding a couple class levels). Could someone venture a thought or two on her new CR and Level Adjustment, if possible? (Please and thank you!) Any and all help from the ENWorld forum's illuminati is much appreciated. Thanks in advance!

 

[Darkness]

So what you get is basically this:

Medium outsider (Baatezu, Evil, Extraplanar, Lawful) (Regardless of your actual alignment.)
9 outsider HD
Speed 30'
+8 natural AC
entangle
DR 5/good, darkvision 60', immunity to fire and poison, resistance to acid and cold 10, see in darkness, SR 20, telepathy 100', true seeing
+10 to all stats (except Int +4, Wis +8)
Bonus feats: Dodge, Mobility
Automatic languages: Infernal, Celestial, Draconic (but not Common)

Around +5 to +6, IMO. (For reference, a full-power erinyes is +7.)