It does sound quite normal for the nap drop it's just that a lot of kids don't do it this early. I think if it has come to the point where it is making you crazy it's time to try something else.
Assuming nap 1 is still going well and around 2hrs long I'd try to get that in the middle(ish) of the day. 4.5hr A time is not bad but 5hr is better for ths nap so that you get 5hr A, 2hr nap, 5hr A then 12hr night - roughly - only a guide!
In reality LO might not manage a full 5hr after the nap and might need EBT which is great if she will do a longer night but not great if it leads to earlier WU next day because then you have a long stretch before nap time.
Some people find LO will go down for the second nap much better if they have totally missed it for a day - a mixture of 1 nap and 2 naps days. It could be 1 day at 1 nap or 2-3 days at 1 nap followed by a 2 nap day to catch up. Personally I would find this hard and so would my DS, we both preferred every day to be the same but some LOs do this mix of 2 and 1 nap days really well.
If you want to give up on the AP for nap 2 do so, no point you getting stressed out every day. Maybe put her down in the cot for the nap and if she plays for 20 mins get her up, so she's had some quiet time. Some kids will do longer quiet time. Mine would do zero quiet time, he'd scream blue murder if I left him in his cot and he wasn't tired. You never know she might do a mix of 1 and 2 nap days if you keep giving her the opportunity to sleep and she plays for a few days but then one day naps.