I assume you know that Adjustment of Status will mean no work and no leaving the US for at least 3 to 8 months. It will also mean no green card for some time...maybe a year.
"D/s" means "For the duration of stay". Yes, the dated stamp is the endorsement. That visa is now a temporary Green card for a year or until the plastic one arrives.
If the visa expires, the consulate can, at their discretion, re-issue it. However, it will mean another medical exam...and possibly another interview. Good luck in getting her CFO done on Monday. She must enter the US prior to visa expiration.
I haven't seen them enter a "D/S" before. However, I don't think it is a problem. The stamp indicates you entered on 2/1/2024. The endorsed visa acts as a full-fledged Green Card for a year.
BTW, I have seen them put a variety of dates.....I think you are fine.