Onis are high damage monsters , and its better of not being tanked if possible. You kill them with ranged dps (which won't eventually be a problem for you since you have 2 good archers). Camilla is a monster healer , and she can outheal even the black healer we have avaible in premium , tho , so she's good (regardless of what others keep saying >> that she's just an improved iris. Well , she is but a much better one)
That being said , lilia is a great princess , and you were lucky with your witches as well. To be fair , i'd level my gold witch first since she has a skill that can help you do war of magic (adele shouldn't be able IMO) . Also , being an elf she has dmaage comparable with a plat witch (for example she has like 6 less damage then belinda) , but adele has a better awakening , by making your team tankier. Still , i'd cc the gold first.
Marr is another unit i would like to have. She won't be a tank healer , but with camilla there , you shouldn't have problems. All in all , very good healer squad.
That being said , i don't specially like gina , and never used zola , but i guess they have their niches as well.
All in all a very high rarity team , and very nice rolls as well. You got some really good units. You should be good in a co6ple weeks or so with this team , even if you screw this event. With your luck in getting plats , you could try for a uzume anyway (assuming you're a paying user and can afford it) , which is a better strategist then the event one