Is BEG Miryo the best girl group rapper that ever grabbed a microphone?

I would

Short answer yes

Long answer YYYYYYYYYYYYYEEEEEEEEEEEEEEEEEEESSSSSSSSSSSSSSSSSSSSSSSS

YES. PERIOD.

She's part of the best female rappers if not the best although I haven't heard from enough gg rappers to judge

Yes

I've heard so many people speak on her skills for a while now. The only missing ingredient has always been hot beats.

There aren't many skilled solo lady rappers around in id0l-dom, but if someone with a good ear for solid beats who can hold their own (like Jessi or maybe Soyeon) could step up and do a lady rap cypher track with Miryo and Yoon Mirae, that would be some true queen 'ish and a good "bridge moment" between id0l-Rap and SK Hip-Hop.

Both of these ladies are OGs and the closest you are going to get to "Mother MCs". It would be a great way of honoring them and seeing women of excellence lifting one another up.