[DU] Sim not in household manager after graduation while playing other household

I have a teen sim that graduated early from high school and then she was able to enroll in college and move into the dorms as a college student. I played this sim for a while and stepped aside to play another sim for a bit (in the same save file)- during this time my sim in question graduated from college. When I went to switch back to play her again, I could not find her at all. I checked "manage households" and looked at every single player in played and non-played sims (I created this sim myself in create a new sim). She is nowhere to be found at all! But! While playing a sim in her family, she was active in the game, but I have no way to access her and make her a playable character again. It's like I lost the ability to play her as a character at all. But she still exists in the game and shows up in the club meetings that she was in when I last played her. 

I have tried several things: 

-Adding her to the family - did not work. 

-I tried saving her profile through create a sim. When I used that upload and placed her in a lot, the game had two of them and I couldn't control the original sim I had made. I had to go back in my saves to reverse this error.       

-I tried becoming roommates but it always gets denied. So, I am trying to get the option for move in to pop up right now so maybe if I can get her in a household then I can play her again somehow. But, the option to move in or be roommates refuses to pop up or work if it does.       *Note: I have never had move in options occur for me unless the romance relationship was high/ and or the other sim asked the one I was playing. Otherwise, it's so hard to find in the options and yes, I have researched where to look and when the interaction might occur.  :(  

I am sincerely at a loss on what to do now. I am just hoping at some point in the game she will be placed in a household again so I can play her again. I worked with this sim a lot, so I really don't want to lose this progress :(. Anyone have any suggestions? I think the bug occurred because she was in a lot/house that required you to be a college student to live there, and since I wasn't playing her when move out occurred, the game may have bugged and not placed her anywhere. I would have expected she would have wound up in unplayed sims in my manage households but - her profile is nowhere to be found and that's my issue as I cannot play her, and I can't get her into a family or house to play her. I have checked every single lot in the game just in case, but she is not in any house. Not in my manage household at all either. Can anyone think of what to do? Thank you :) 

*Note- I do not use any mods or CC content items/ only the EA DLC's for the game. 

Edit By Crinrict: Adjusted Title to better reflect the issue