@alex51299: First, do you have ITF installed or not? Because I would be careful with using backup opportunities because of the ITF skill op bugs. And I have no idea what other ops you have installed.
But anyways...
1. Have a stint as a Private Investigator, as the PI jobs count as career ops. You only need to do two and it can still leave plenty of room for another heir to do the job.
2. If your second generation is a young adult, make use of your university welcome kit/buy one and trigger the "Go to University" op (it's a special op and counts). If you take that option, your founder could and should go into science/medicine, as that major sometimes triggers career ops of its own. But please check every op because a lot of University ops are "social" and don't count.
3. Look around town for community events like Neighborhood Grill-a-Thon, as those take up the special op slot.
4. Join a rabbithole career that isn't planned for another immortal. As a bonus, she'll have something to do after immortality with it.
I can't say anything's guaranteed, even with those, but it's all worth a shot. Break a leg!