My Female Barn/Garage cat (4 Months old) is missing, any tips?

Hello All, Me and my family got two barn cats Beth and Ripp, Ripp being a few weeks older than Beth and acclimated them both. They’ve been with us for a while now, and haven’t disappeared for more than a day until now. Beth, who has been spayed (Ripp has also been neutered), went missing Sunday night at around 6PM and Is still missing currently Wednesday, at 6PM. We do live in an area where Hawks and Owls could be about, though I haven’t seen sign of any. Where could Beth have gone? I’ve seen Ripp several times, and the two of them were irrespirable. He does seem to be acting normal, though, and not distressed at all.

Let me know if you guys need anymore info to better help me figure out what my next steps should be, thanks!