Smashing the window from the inside can also have similar effects, depending on how it was done. It's not enough to show it 'could' have been done that way in order to claim it 'was' done that way. One also has to rule out the other ways it could have happened.
You also are not taking into account all the other variables. Filomena disturbed the room. She lifted up her items and shook glass off of them, to see if anything was missing and to find her computer and may also have kicked or trod glass around by moving around. This means detailed theories built on the positioning of the glass in the room 'after' her entry cannot be made, especially as the before was not recorded.
You also are ignoring other important established factors. We know the rock was not thrown from outside since, not only is it highly unlikely (the neighbours could hear screams and running but not a giant rock being flung through the window like a tank shell, the illogical and unlikely entry point the window would have made etc,), but since we know the outside shutters were closed tightly, albeit not latched. To keep insisting the rock was thrown from outside is no more then a point of 'religious faith' combined with a bloody minded determination not to concede the point for winning's sake and is frankly, risible verging on the pathetic.