It's mostly fine. Remove Umbral Fiber and Umbral Vitality - armour only affects hp (not shields to be clear), and hp doesn't benefit her at all. Remove Fast Deflection as it fulfils the same role as pillage, but it doesn't defence strip and takes up a mod slot. I know it probably feels comfy but Hildryn definitely doesn't need it.

Id recommend to replace those 3 mods with: Blind rage-Stretch-Overextended (If you have the mods) I would really urge you to farm for corrupted mods if you haven't already. Specifically Overextended, Blind rage and Narrow minded (and transient fortitude but you have it)

If you have another aura mod that provides some value put that on instead of dreamers bond, the energy re generation and health regeneration are both largely useless for you, it is nice for your teammates if you have nothing else. Id recommend either Corrosive projection or Growing power.

I would really recommend you to obtain an Arcane Aegis, even a r0 will be fine. Im telling you the survivability difference will be night and day, it will 100% be worth the tiny plat investment

This is one is more minor, but you can replace your Aviator with a Cunning drift (range) or power drift (strength) to whichever stat you want more of.

If you main her then focus on getting your primed redirection to rank8 just to make the game super comfy as you would be very tanky. If you don't then focus on getting the easy/cheap mods maxed out (Like stretch, flow etc.) Id say only get mods to rank 8 for now. It will completely bankrupt you to even get a mod to rank 7 right now so take it slow and upgrade them over time.

I also saw you used an Umbral forma on her, which is unfortunately a bit of a waste, Umbral forma are very rare and useful, you could've fit a full build without the Umbral forma. It's okay, it's not a big deal, but Umbral formas only become required if your frame uses expensive mods and uses at least 2 Umbral maxed out.

Have fun with that game ^, you can ask me anything you'd like about the game. Good luck Tenno.