@jesusismysavior She even recently accused me of child abuse, to try to get 50/50 custody
This statement doesn't make sense to me; most parents will falsely accuse the other of abuse in order to gain 100% or majority (over 51%) custody. If she did make a false accusation to proper authorities & the accusation was determined to be "unfounded" or "lacked support" (in other words, she lied), this is a form of parental alienation & is severely frowned upon by most child/family courts.
If you are a decent parent, who genuinely has their child's best interest in mind (even though they may currently lack the skills), you both reside w/in a reasonable distance to transport child to/from daycare/school/doctors/etc, AND you currently have 50/50 custody/parenting time, most child/family courts will not break status quo & give one parent majority custody. There are of course exceptions & each situation is different.
If you have not yet actually filed in court for a Proposed Parenting Time Schedule (or something like it), I would highly recommend you seek out a lawyer/paralegal/library that can help you get the process started. If you are just trying to make an agreement with your ex without involving courts, you can of course use mediation or a decision maker for this instance. If all reasonable attempts to come to an agreement outside of court are met with unreasonable demands, please seek out legal assistance.
The schedule you suggested to her (M/T you, W/R her, alternate weekends) is called a 5-2-2-5 schedule & is consistent with most parenting time discussions. If she is unwilling to go more than 2 days, then keep your daughter every 2 days. You'll still get weekends & holidays (if you don't have an alternate holiday schedule) and you get your daughter every 2 days even if there is a holiday.
Good luck! Remember it seems like this won't ever end, but it will.