I know they will rule against it. You seem to have good legal knowledge so I have a few questions.
Who would be the victim? It has no birth certificate, no social security number, and no name.
Seeing as we all have individual rights can a mother get a court order for the fetus to stop trespassing in her body? What would legally obligate her to take care of it inside her body? You can give away your kid but how does that work with a fetus?
If its life couldnt a woman have an operation to remove it rather than abort it. That it cant survive outside her body isnt her problem legally.
Can a woman sue her fetus for damaging her body or for trespassing in her body or property?
Can a woman bill this "life" for services rendered?
If its life and given full rights of a person wouldn't it have to be treated the same legally as any other person?
I'll start with this disclaimer. I'm not advocating the legal positions I'm putting out here, just explaining how there could be defensible legal positions here.
In every crime, the ultimate victim is society. It's why criminal cases are prosecuted by "The State" or "The People" and not the named victim. Think of cruelty to animals. Who is the victim? The animal has no birth certificate, no social security number, and often no name. The victim is society. We've determined as a society to extend certain protections to animals and violating those protections opens you up to prosecution.
You're getting into the balance of rights here which is something that does happen. If rights are extended to a fetus, can those rights trump the mother's rights? A court could determine that a fetus' right live is greater than the mother's right's to autonomy over her body. You could analogize it to how necessity is a defense against other crimes. If I'm freezing to death and break into a cabin to survive, I've not committed a crime. My right to live has been given preference over a property owner's property rights.
As for the operation example, the same tactic has been tried against abortion in criminalizing the performing of the procedure and punishing doctors. You're not infringing upon a woman's right's to her body, the law doesn't apply to the woman at all. It only applies to the doctor. The end result is abortions being unavailable so the fact that the law doesn't apply to women doesn't matter. The result is what matters, not the process. The same is true in your operation example. The fact that the fetus dies outside the mother's body on its own isn't relevant. The result of the action taken is the death of the fetus and so if the fetus has rights, those rights might be violated.
Interesting question about trespass. The answer is no. Minor children are not responsible for their tortious conduct. Their parents are. The woman would actually be responsible to herself.
As for billing the fetus, again the answer is almost certainly no. Parents can't bill their children for the cost of food, clothing, etc. The same would extend here.
Would a fetus given personhood have to be treated the same legally? Not necessarily. Children are treated differently under the law than adults. Men and women are also still treated differently (for example, a woman can't commit rape in Georgia and a man can't be raped, the definition of rape requires it be a man on woman crime). Married people are treated differently than single people. The most common horrible people throw out is that any miscarriage would have to be investigated as a murder. That's not how it would work in practice at all. Not every death is investigated as a murder. The vast majority aren't. So people are often treated differently under the law and if you had fetal personhood there would undoubtedly be ways that a fetus was treated differently.
Again, I'm not advocating any position here. I'm just throwing out the legal counterarguments.