1) Yes. Take tomorrow off.
2) You can call the hospital & speak to one of the advice nurses. They'll look up her ER records, and explain everything to you.
3) IN GENERAL: (the consulting nurse, and then your Ped will explain better) Expect 4-6 weeks of recovery time. She won't be flat out like she is now, but she'll be at risk for relapse is she tires herself out being too active, and at risk for full on pneumonia, and will need limited activity for the next month *however* she'll most likely be able to continue MOST things (no sports, no getting wet & chilled, limited excitement, extra naps & early bedtime BUT we're not talking bedrest. She'll be coughing/congested/tire easily, but will -once not contagious-be able to return to daycare, go to the park, etc. if that doesn't make sense, think of it this way: Usually park for 1hour = park for 15 minutes. Park for 30 minutes = flat out for the next couple days, park for an hour = back to the hospital. So, normal, but limited after a week or so. Then gradually increasing time until she's back to 100%).
Obviously, not right away... But walking pneumonia (and pneumonia) linger. When she seems better (probably in a week), she won't be. She'll still need lots of extra rest, fluids, and limited active for a month or two before she's ACTUALLY better