hiya! well i think it'd be hungry if I only had yoghurt before bed LOL but its hard to say with LOs, if she's used to that then it may be fine. You could try however giving her a snack at 3.30 yoghurt, fruit etc then dinner around 5.30? Does she have a bottle before bed?
It does sound like SA in which case, u have to kinda ride it out!! We had the same prob, maybe still do to some extent. In which case I would try a gentle removal plan to get her into cot and soothing herself, rather than attempting wi/wo.
Ds was waking every 20mins to 1 hr until recently then 2 molars popped out, have u tried giving pain meds? this may help with some of the nightwakings.