My daughter swears her almond tree turned into peaches. The first year she had some almonds, but something got them and her cherries too before she did.
She had planted some peach trees in the backyard and two dwarf almond trees in the front the next year they looked like peaches tasted like peaches, and the pit looked like a peach pit.
We wondered if the almond trees were grafted onto peach tree stock or something, and the basic stock took over.
Weird! Our two Catahoulas keep animals away, so we should not have issues with our fruits and nuts. They also chase birds off. Relentlessly. Our bluebirds give them the fake and go to their boxes just the same.
Our fruits and nuts presenter told us that the Stone Fruits such as nectarines, peaches, plums, apricot, and cherries are the same species as almonds!
Peaches are Prunus persica and the almonds are Prunus amygdalus. Since they are the same species, they are graft compatible!
Your daughter is right! The almonds grafts died back to the peach root stock.