Could you please explain the construction of this sentence?

[hoangkha]

Hi!
- She is always the first one to get up in the morning to make sure that we leave for school having eaten breakfast and dressed in suitable clothes.

[Natalie1991]

Can you explain a little better? I'm not sure what you are asking.

[hoangkha]

Can you explain a little better? I'm not sure what you are asking.

I am wondering why HAVING EATEN is used in its place in that sentence?

[billmcd]

I am wondering why HAVING EATEN is used in its place in that sentence?

I don't remember who posted this originally some time ago with the exact example, but as Yogi Berra is alleged to have said, "this seems like deja vu all over again".

From beatthegmat.com
Perfect Participle Phrase used in the active form with "Having" + a Past Participle. It shows that the
action takes place before the action mentioned in the main clause.
Example:Having brushed my teeth, I went to bed.