Here are a few polished versions of your sentence:
Set featured image✨ Clean & natural
“When I said my mother-in-law watched my daughter during the day because I had returned to work, he didn’t nod in approval the way I expected.”
📖 More emotional flow
“When I told him my mother-in-law was watching my daughter during the day since I’d gone back to work, he didn’t nod in approval like I expected.”
🎭 Slightly more dramatic
“When I explained that my mother-in-law was caring for my daughter during the day after I returned to work, he didn’t respond with the approval I had anticipated.”
📱 Social media style
“When I told him my mother-in-law watches my daughter while I work… he didn’t react the way I expected 😶”
If you want, I can also help you continue the story or turn it into a full narrative with a twist.