Sorry this happened to you Annie. Sometimes these things are a blessing in disguise...though it may not seem that way just now. It certainly wasn't the best work environment.
I'm always sceptical of these probational, 'trial work periods' and want you to know that your experience with this may not have anything at all to do with you personally, or the quanity/quality of your work.
For one position I had -the 3-month trial work period was never meant to turn into a permanent position, though that was what I (and those before and after me) was lead to believe. The company just kept bringing in a new girl every 3 months. And the funny thing was that they'd have us train the new girl before we left.
The girl who trained me had clued me into this. She was excellent at this job and I found very little, if any issues with the work she had been doing.
The "trial work period" meant that this company could fill a position without ever having to shell out benefits and they probably avoided other employee related expenses too. And this was also cheaper than going through a temp agency.
All they really wanted was someone to be there and know the job well enough so that the bookkeeper could go on vacation and have someone there to keep up with things.
Whether or not this was a similar case with the place you worked at....I just get the sense that it didn't have anything at all to do with you or anything you did or didn't do.
Your supervisor behaved terribly and there's no excuse for that. It's an aweful thing when the politics and games can affect one's chances of making an honest living.
Again, I think there were some extraneous factors going on there and that, although this affected you adversely, it most likely wasn't a reflection of your work, etc.
Please be well and I wish you the best in yor employment search
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Pam