Unfortunately, "was told" is a well known source of misinformation. The correct source is the I-130 instructions. Time to become an A-Student of those instructions, file the other two petitions, and wait another year or so, for them to be approved. Then, you proceed with all three at NVC. In the meantime, stay in contact with NVC to keep your wife's case open. They need something from you at least once a year.
If you were a green card holder instead of a US Citizen, you could have filed just one petition. Your failure to study the actual instructions, put you in the place you are. Don't make that same mistake twice.