It sounds like you save file is acting a bit weird, the item limit is a known thing tho. For not being able to give your Sims daughter a hobby or job I would suggest contacting EA.
You can do so through The Sims Mobile app. Open the side menu, choose the gear icon, then the button with 'Help'.
This will open your browser, scroll down until you see 'Contact Us' and choose 'Technical Support'.
Open the spoiler for pictures:
If this fails for some reason, or you can't access The Sims Mobile app.
You can contact EA through this link: https://help.ea.com/en/contact-us/
If you want to do so in a different language you can choose your country of choice in the upper right-hand corner.
You can also choose to contact an EA game advisor through social media:
- Twitter: https://twitter.com/EAHelp
- Facebook: https://www.facebook.com/EAHelpHub/
