I just had a thought. I think we've all assumed the OP is high school age and therefore tried to reason as you would with a young adult, and we've debated her points to show her other sides to the issue.
But what if this is a very young person, say 12 or under? At that young age, many schoolkids are terrified of the mechanics of death, especially if they didn't grow up on a farm. I've seen many young girls emotionally traumatised by their first confrontation with animal death, whether it's the death of a pet or seeing a report on the actuality of slaughter. Over 90% of the Australian population, for instance, is urbanised and never exposed to animal births, deaths and the realities of food production, let alone what happens in natural ecosystems.
If we are dealing with a girl 12 or under, debating is unlikely to go anywhere with this issue; people need to live and get life experience to get perspective and deal maturely with things like this.
Our OP is showing compassion for animals, which IMO is in itself a good thing. Since we know that stopping animal slaughter is neither feasible nor necessarily desirable, why don't we start a list of suggestions for how that compassion can be harnessed to make a positive difference to the welfare of animals, whether wildlife, companion animals or food animals?
- Making your surroundings wildlife friendly: Many Australians, for example, are planting shelter belts on farms and native plants in their gardens to provide habitats for wildlife, such as songbirds, bandicoots, possums, gliders etc. Shelter belts also give shade and protection to domestic animals.
- Sterilising your pet cats and dogs
- Not breeding an animal without careful forethought, which includes careful selection of breeding animals, and never breeding casually just because it might be "cute" to have a litter of puppies or kittens, or some other "adorable animal babies" - adorable they might be, but they grow up and are entirely dependent on us for their welfare
- Thinking about growing and killing your own food animals, and making sure they have good lives before they become food
- If that's not possible, then looking at where you are sourcing your animal products, with a view to how these animals are kept - e.g. looking for genuine free range eggs, pasture-fed beef, free-range pork, and accepting that you will pay a higher price for products that come from production systems that offer better quality of life for food animals
- Remembering that in the wild, every animal is eventually a food animal (except for extreme situations, like an animal falling into an active volcano or a peat bog)
- Thinking about getting your next dog or cat from a re-homing facility rather than a breeder
- Thinking about whether you might like to adopt and ride a Standardbred, OT Thoroughbred or rescue horse, like many people on this forum are doing (but also not judging people for buying good horses from breeders - because it would be a pity if we lost great horse breeds because of over-breeding elsewhere)
- Thinking about whether you might like to volunteer to help out at a dog pound or similar organisation
- Thinking about whether you might want to volunteer to walk a dog for someone who is sick, or overwhelmed with demands on their time
- Not littering, and helping clean up seashores or your local nature patch because plastic litter in particular can create a lot of trouble for animals
That's just a start. Anyone want to add ideas?