She should be alright but she might bruise a bit. you might have hit a blood vessel or vein. I've never had blood during an injection but I've talked to folks who have. Its not going to hurt her but don't be surprised if she has a bit of brusing or slight swelling in that area. Just don't inject in the same area tomorrow. You can GENTLY put the needle in and SLIGHTLY pull back on the plunger if blood appears move to another spot. This will ensure you don't hit a vessel or vein again.if when you pull slightly back on the plunger blood appears in the syringe just change spots. hope this helps. She should be fine maybe she will get a slight hematoma(bruise and swelling) maybe not. If she does it should be ok. Have you ever got a shot from the dr that gave you a bruise? That's a hematoma. Just check the syringe next time like I explained and this should help. You will be a pro in no time! I wish you the best and hope this is helpful to you.