got back from a tiring weekend at nec, I'll throw more into my thoughts on this from playing mynus in casuals. This matchup I would put in millia's favor. 6-4 or 5.5-4.5, I wouldn't know to b exact, but I'll stand my opinion at 5.5. most of it's mentioned already but here's sum more info i should add.
-millia 6p is good as an AA when i-no tries to approach u air to ground. avoid using it as a ground poke bcuz stroke the tree will trade nd hit u still. on ch, i-no can shake out in time to combo. in addition, it's going to be baited a lot so don't get too caught up on that.
-SG would be considered a free punish for i-no midscreen on startup bcuz she gets free hcl. its still ok to use it on fullscreen after combo or knockdown.
-i-no's od option to get out of oki loses to fb disc oki for free. nonetheless keep an eye out on her meter nd bait nd punish it.
-fish for knockdowns w/tip of 2d. millia's pokes are better than i-no's so playing footsies is effective. 2d and 6h beat out stroke the tree. iad back j.d when she tries to dash at u for air to air. she can still beat the start up or trade so watch out and don't get predictable with it.
-pin is very good at shutting down her momentum when she tries to start on it. like in a majority of her matchups. abuse the hell out of it nd capatilze on the chs when u land it. millia has more control in the air over i-no.
-as mentioned she can run under HCL and punish it.
-Knock her down once, she's dead. If she knocks you down, do your best to block because Millia doesn't have any reliable reversal out of her oki either.
tl;dr
Millia has advantage in neutral ground and air.
Stay in the air a lot when you have the pin and abuse it.
Don't let I-no get her momentum rolling when she knocks you down.