This is very out of date as most of these nuns have left OLAM. There are only about 8 now in the community. They need our prayers as they strive to rebuild their community.
Didn't most of them leave to form new convents? That's the way it's supposed to work.
There are 13 professed members at OLAM, with a couple in formation. There were about 12 who left to form or shore up other communities. There was also the former vicar who has gone on to found her own community in Italy. There were others who just did not persevere, either in OLAM or in the monasteries they founded. Some were in temporary vows, but there were a few I believe who left after final vows. These things happen with changes to leadership, and I think the convent worked really hard to help re-establish itself with Mother Angelica out of the limelight. It may never be as numerous as it was before, but it may be stronger. They definitely looked like they were putting the work in to maintain the community instead of letting it flounder (they had nuns from different, and well-established, communities with them for about two years iirc.) We should never take our monasteries for granted.
No, most just left either after their temporary vows ran out or got a dispensation. A few went to other PCPA monasteries.