I'm really late to this so Im' confident this will be overlooked or buried but
I play Titania quite a bit, and here are what I would suggest as far as fixing her kit up goes:
Her 1 and 3 are practically the same thing. Change her 1 to something else
Let people cycle between her 2 buffs and hold it to cast like other frames have received.
The reflect buff doesn't do anything useful. It's concept is neat but she's not really the frame a skill like this should be on. Please change it to a heal
Accuracy down is a placebo. It doesn't feel like it works and I don't even notice when it's on / off.
Cast times across the board are slow. For her buff? This is okay I think. However her cc ability (3) should be quicker.
Also, enemies need to actually obey her 3. Sometimes they'll just decide not to despite being right next to the g l o w i e b o i
Seriously, please give her a heal buff
A neat idea for one of her buffs is to cause the weapons of hers and her allies to fire target-seeking projectiles or something. Basically Pax Seeker I guess minus the auto headshot
Make her buffs scale with power strength
boost her energy capacity
These suggestions will keep her interesting. As it stands now, her 2 doesn't even feel worth using and two of her other abilities are the same thing. If her buffs are all good it'll encourage them all to be used, meaning she'll use lots of energy and have a bunch of interactivity instead of just being a press 4 and do that for a while frame.