Sometimes we just want someone to listen and not provide a solution. Sometimes it is just a comment or statement of fact. Other times we drop a hint and y'all miss it. Add pregnancy hormones to it and gets more complicated.

She is growing a whole human inside her body - the further along she gets, the harder it will be to get comfortable which definitely will affect how well she sleeps no matter when she sleeps (also factor in the multiple trips to pee that interrupt said sleep). And, achy feet are pretty common as increased weight gain and any excess fluid she may be retaining affect that.

Correct response to first issue: What can I do to make it better? Chances are she will say, "Nothing."

Correct response to second issue: Tell her to sit down and give her a foot massage.