Debi ~ William and Louisa (Petri) Waeltz were my great-grandparents. Perhaps Phillip emailed you privately, but in case not, I though I would take a stab at answering your question about Caroline.
I do have a Caroline my records, born 16 Dec 1865 to Phillip and Katherine Elizabetha (Schmersahl) Petri. However I have her spouse as Walter Crenshaw. She died in 1933 in St. Clair county, Illinois. So, unfortunately, unless Phillip had another match, I don't believe she's the same as yours.