Some flaws...

[RoyaleBeast]

Ok heres wat really happend with amabel. She was always infected. thats why theres no icon when she video chats. She was trying to lure you in and then the Tuurngait would have you dead. But clarence had a change of heart. Instead of wanting philip dead he came to liking him being alone instead of being "one" with the Tuurngait. Thats why when you first hear him talk he says "why cant I hear there voices" thats also why they kill him in the end. Cause he was seprate from them Tuurngait and had his own body. So in an attempt to make philip want to give up on the cure and hope he made her body look like a human when he killed it. But sadly she kept notes on how to make the cure so clarence just fueled philips anger to cure himself.

Also about the frisk thing. What did you think it was? hmm lets see notes talking about a dog thing that eats other dogs and burrows in the wall. Philip even says "i hear something in the walls" also the notes about Frisk killing the dude at the begining of overture supports it. It burrowed out of the wall and dragged him bac into the shelter.

The amabel thing is THEROY but it is very well supported by most events.
Well the only thing I can think of about it is how she talked normal when infected. Our friend in the computer section around the begining may help us prove the theory. But since we never saw him before he cut his hand off we can only make assuptions.

EDIT1: ALSO the theroy about clarence making her look infected is most likely false (pretty much stated by my theroy) but we've seen wat happens with illisions when they attack u. We get a glass explosion type thing going on. It happens I belevie twice in the game. One with the spider and one with the dog in one section of the kennels. ( NOT FRISK DONT EVEN THINK THATS WHAT I MEAN) plus it happens in the begining of requim as well. But since that game has no affect on BP or Overture it doesnt really support my theroy