How does one go from thinking you are “the most amazing person” she “has ever met” to thinking “we’re not meant to be” 12 hours later?

I’ve been talking for about a week with what seemed to be an amazing woman of 28 years old with two young children. We met on a dating website. She showed interest and initiated first contact with me. She seemed very genuine in wanting to be married and to have a family. Every single conversation we had on text or over the phone was positive, respectful, and nothing short of amazing. Her feedback and response was nothing but complementary and constantly letting me know “how lucky of a girl she was to have met me” because I treated her very kind and listened to her. Her ex abused her and even was charged with assault. She would even ask me to stay up later and continue talking with her when I offered to be done with the conversation so she could go to sleep.

But weird things would happen after almost every conversation over text. After the conversation would end, I would send a ♥️ or a picture of some flowers to which my text would not go through on multiple occasions. We were both on Ichat of which normally a sent message is blue and “delivered.” But that would not always occur when my texts being sent at times would turn green for 8 to 12 hours at a time. I would text a question such as “would you like to have a phone call here in a bit?“ To which the text received from her was an abrupt “no“ answer. Immediately following, my follow up text would not go through like I was being blocked. Approximately an hour later, all of the sudden I would get a message back saying “yes I would love to talk on the phone” and “sorry that was my 4 year old playing with my phone.” Just very weird stuff almost as if she had multiple personalities or something. It was like talking to two different people with 180° differences.

I jokingly said that I hope I don’t scare her away, to which she said “I could never scare her away” followed by her sending lots of hearts ♥️ ♥️

Updates
1 y
Perhaps the most upsetting of all was that a few days ago, her ex fiancé and father of her two children purportedly came to her home, stole her phone, and started texting me a bunch of very nasty stuff. He brought it back to her the following morning to which she apologized profusely and said that it was not her saying those things but that her “crazy ex stole her phone.“ She claims she cried worried that I would not want to have anything further to do with her because of the things he said
Updates
1 y
For the next 24 hours following the incident with her ex, things seemed to be in complete bliss with her telling me how much she adores me and that she is thankful for my being in her life, all excited for what the future could hold. We had a date planned for this upcoming Wednesday evening to meet in person and really get to know each other on a much deeper level.
How does one go from thinking you are “the most amazing person” she “has ever met” to thinking “we’re not meant to be” 12 hours later?
Post Opinion