Hi Ella!
In this instance, the woman is replying "let me just hop right on that" sarcastically as she is angry. The meaning of the phrase would be something like "I'll do that right now" - obviously in this instance, the speaker has no intention of actually making dinner for the man as she is upset!
Without using this phrase sarcastically, it would be a reply to say "I haven't done that yet, but I'll get started on it now"
I hope this helps?