This is the dialogue from my English textbook between a mom and her kid:
Mom: I'm going to be home late tonight. I have to go and visit Grandma after work.
Kid: What time will you be home?
Mom: I'll be home after dinner. I'm sorry, but you'll have to cook dinner yourself.
Is there any difference in meaning if I replace 'cook dinner yourself' with 'cook dinner by yourself'? (For me, 'cook dinner by yourself' means cook dinner alone, but I'm not sure if that sounds correct in the ears of native English speakers.)