They will know of all her legal entries.....and I would expect some serious questions about the length of her stays (those are not authorized tourism stays) and how she legally re-entered with overstays. An overstay will immediately and automatically void an existing B2.....and getting another B2 with previous multi-year overstays is difficult. Therefore, these dates, if for legal entries, just don't make sense to me. I would not be surprised if they look for misrepresentation of some kind. She might even need a waiver.
Which entry did the attorney omit? The 12 year stay?