Ok, so here's an update - I'd love to say that all is resolved, but instead we are in a holding pattern.
Last Wed. she slept from 10:30pm till 5am, fed, back to sleep till 7am
Thursday from 10:30 till 4:30, fed, back to sleep till 7am
Friday from 10:30 till 3:30, fed, back to sleep till 7am
Saturday on from 10:30 till 2:30, fed & RESTLESS till 6, give paci & extend her sleep till 6:30am then have to restart day early (at least she's going back to sleep after 2:30 now, but restless the rest of night & not getting a solid sleep)
As you can see, it gets progressively worse from Wednesday evening & then resets (been this way for last two weeks). I've extened her daytime A times to 1:20 - I've reduced her evening catnap to 20 mins - I've given extra feeds - nothing seems to work.
I thought about eliminating her DF & just nursing her at midnight in the hopes that she'll sleep after that till 5 am, but that doesn't help me much since I'd have to feed her twice after I go to bed instead of once. And besides, I don't know if that'd work anyway.
I can't do away with her catnap alltogether yet, she wouldn't be able to make it thru the evening without a meltdown.
I don't know if I should extend her A times any further, she can barely handle what I'm doing now.
Do I just have to resolve myself to feeding her every 3.5 to 4 hours at night (6:45p-10:15/2:30-6 - then hope a paci helps her go back to sleep till 6:45 & restart day early)

?
I think she should be able to sleep consistently for at least a 5 hour stretch since she does sometimes & she's a good weight (at least 13 lbs) so she's eating well & should be able to consume enough to hold her those longer stretches too. And her sleep should be deeper it seems.