GAW -“No one taught it to her, she self-taught (or learned it on her own). Therefore, no Tiflus was taught.”
Your implication that the S’A would hold in such a case that it would be Mutter is wrong.
I’m quoting Joe here from another topic, only because I didn’t want to write the whole thing over myself:
“Shulchan Aruch Yoreh Deah siman 246 sif 6.
Shulchan Orach:
“tzivu chaza”l shelo yilmad adam es bito torah mipnei sherov hanashim ein da’atan michuvanos l’hislamed u’motzios divrei torah l’divrei havai l’phi anius da’atan, amru chaza”l kol hamilamed es bito torah k’ilu milamda tiflus”
So from S’A it comes out the problem is for them to learn it and therefore you can’t teach it to them -“u’motzios divrei torah l’divrei havai”. So the avg. woman can’t just learn Gemmora because it will come to “Hevel” (nothingness). There are exceptions to the rule, like Bruria and that’s why the S’A says “Rov”. But who nowadays can claim that they are on such a level and can learn Torah without the possibility of it turning into “Hevel” (nothingness)?!?!