Sis, totally normal yan, bawat body talaga different after delivery! A few of us had IE after NSD, pero iba-iba ang healing process, kaya hindi lahat dumadaan doon agad; your friend might just have less perineal trauma or mas mabilis sya nag-heal, which is lucky lang niya talaga haha. Best to check with your OB kung concerned ka pa rin about your healing or kung may unusual symptoms, pero honestly most of us just let it be and it settles within a few weeks anyway!