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Fire investigator Jim, eh?
Whether or not she was targeted, her car definitely was.
Had someone lit a slow match and tossed the device under the car, I would be willing to assume vandalism and a non-specific target.
But rigging a wire to activate a detonator when the car moves is definitely targeting the car and its driver.
The law presumes that a perpetrator intends the ordinary and forseeable consequences of his act. It is ordinary and forseeable that the next person to move that car would be its owner or a member of her family.
Hint to police: check out all ex-boyfriends and wanna-be boyfriends.