Problems :(

I just got the game a few days ago, and it's already screwed up.

Here's what happened:
My preggy sim finally had her baby. One of her adopted daughters was aging up. I used the cas.fulleditmode cheat and modified her in CAS. When I was doing this, my sister entered the room and wanted to see my sims. As I was showing them off, I noticed, it was saying the sim that just had the baby was still pregnant! I exited CAS and noticed, her baby was in the bassinet like before, but she had a baby bump still! She gave birth AGAIN and poof. There was a SECOND baby. I waited a while to finish editing my sims, and then went back into CAS. The same thing happened and then there were THREE babies! I aged them all up and tried to edit them. It said she was pregnant again and it said she had the baby, but came home without it. That's probably because there were 8 sims including the unwanted babies. Every time she had a baby, she aged up to Adult from Young Adult, and when I re-entered CAS, she magically turned young again.

I decided to age up my teen sims and move them out of the house and continue the game with just them. I aged them up fine, but it wouldn't let me move them out because "you cannot do this while a sim is aging up". None of my sims were still aging up. I checked.

I tried killing off the infinitely pregnant sim in any way possible. Drowning, Starvation, Fire, Old Age, Anger etc. But I ran into problems.

1. I couldn't drown her because she kept exiting the pool when she was about 2 minutes away from exhausted.
2. Starvation took way too long and she kept eating food while I was trying to keep her family alive.
3. Fire didn't work because she was too good of a cook.
4. I aged her up to elder, set the life span to short and waited for 5 sim days. Nothing happened.
5. I had her make an enemy, make the enemy make out with the problem sim's husband in front of her, and made them fight over 10 times. She was just uncomfortable and never got angry.

Those are just the 5 I tried.

Oh I forgot to mention, the reason I couldn't trap her in a room or the pool was because my build buy mode just disappeared. There is nothing in the spot where it used to be. Entirely empty.

I eventually gave up and went to the main menu without saving. I tried making a new sim, but the same thing happened! Well, not the preggy thing, but the build buy mode. It's completely gone! D:

I really like the game and want to play, but this is making it impossible!