I would continue with w2s for a week before leaving lo to settle herself. It can take that long or longer for lo to real habit of waking at certain point in cycle.
Re night sleep it is normal for Los to walk and ss several times But at 3.5mo I would imagine 1-2 NFs besides DF would be normal. Have you tried feeding at 2.30 waking to see if rest of night is more settled? I know u say she doesn't cry but may just be peckish rather than full out starving...Dyt it's worth a try?
