Don't give up. First, sit down, take a moment for yourself, and b-r-e-a-t-h-e. There are lots of issues here, all of which can be addressed and, in time, you will have a daughter you can live with. First of all, sit with her at a time when she is being good and try to have a simple talk -- remember she is only 8, so keep it short. Tell her that you will no longer tolerate her disrespect. The next time she misbehaves or swears, she is to have a 10-minute timeout somewhere non-stimulating. It can be the kitchen table -- just ignore her if you are there. While she is sitting there, she is to write a simple apology to you. She can also draw a picture to express how she is feeling. Date it and save it. At a separate time, talk about her bathroom hygiene and ask her why she doesn't wipe and wash up. You may be surprised at her answers. You and she can go shopping for special flushable wipes -- either the baby ones or the feminine ones -- and perhaps a nice soap and hand towel to make it more appealing, or even the hand sanitizer if she's just in a hurry. Reward her efforts with a hug; non-compliance gets her sent back to the bathroom -- calmly. If she refuses and makes a fuss, it's time-out time, or she can't go on to the next activity, whatever it is, even if it's school and she will be late. Let her be late and take the consequences.
As for the school issues, you DO need to get her evaluated. She is already labeled -- as TROUBLE. Better to be labeled with ADHD and getting treatment for it. Treatment can be meds, but doesn't have to be. It also involves behavior modification. You also need to stop remembering her books and assignments for her. Let her face the consequences at school of missed work or misplaced books. I know this is really hard to do -- I was guilty many times of asking about assignments and bringing in forgotten things to school. Remember she is only 8; if she gets an F it's not the end of the world. This isn't high school, where the grades really count. She should have an assignment book or folder where she puts everything. You can look at that when she gets home from school and help her organize the items on the table. they have to stay on the table till she's done with them. When she's done, everything goes back into the folder and then into the backpack. This is another sign of a child with ADHD, but it is an area where she can help herself. If she can't work independently, then perhaps you or your husband can sit at the table while she is working and work on something of your own. Tell her you are confident she can do the work and (not but) you'd like to keep her company so you can both work on a task. You can balance your checkbook, do sewing, read a book, peel potatoes, etc. You are showing her that her work is important and that you believe in her. She may need to get up every 5 or 10 minutes. If so, that's ok, as long as it's just for a minute to get a drink of water, stretch, etc.-- not to go onto to something more fun. You can do a bend and stretch with her, then say, ok, time to get back to the table. If she has ADHD, she can't sit still for 30 minutes and do it all at once.
Go online and google ADHD. There's plenty of information out there. Ask your pediatrition and your school's guidance or health office for information. If she is in public school, she is entitled to an evaluation by the school district for ADHD. Her kindergarten teacher should have recommended it, but she probably didn't want to say it directly and get herself in trouble. When the teachers told you that she has trouble focusing and sitting, they were hoping you would read between the lines and get her tested. If you don't want to wait until the district can do it, there are many private evaluations available. Ask your pediatrition and any friend you have whose child has been diagnosed with ADHD. Children's Specialized Hospital in Mountainside has a team.
Go to the empoweringparents.com website. James Lehman is the author is a DVD series on parenting. I have used the DVDs successfully. He also has much information on ADHD children, both professional and personal since his adult son is ADHD. It's worth the money to get the DVD's and subscribe to the website -- you also get a hotline to call anytime you need advice.
Keep up your efforts. Your daughter is worth it. I have two ADHD children, now young adults, and a third with significant emotional issues. It's a challenging job and you can do it with help from your husband, family, and friends. Prayer helps too. I wish you well.