I think it is not just wrong but VERY wrong to put your daughter in another vehicle. She CLEARLY is not a safe driver. There is no way that she had 4 accidents and was totally blameless until this 5th one. Her driving habits put her at risk for the accidents and she is truly blessed that no one died in one of the accidents.
Giving her a car or cosigning (which is giving her a car because you will be making those payments - at 19 and not even seriously looking for a full time job there are 2 chances she will make the payments - slim and none!) for a car loan may help YOU and husband feel better. It will NOT help you daughter learn the life lessons she needs to learn, lessons that it is your parental job to teach her.
A car in the hands of an irresponsible person is a deadly weapon. She can get rides from friends or walk the long way around the bad areas or get a bicycle or find some other way to cope. Given that many accidents, how often have you drug tested her or checked to see if she is sober before she drives or when she comes home?
Cars are not a right, and neither is driving. She can use her wages to pay a friend to drive her to work, or to pay a cab or if you have time and inclination, to pay you to drive her to work. If one is that critical, maybe she should look harder for a job so she can purchase one and pay her insurance.
You are putting a clearly irresponsible person in charge of a deadly weapon on busy streets if you help her get a car. You are TEACHING her that it doesn't matter how bad or often she messes up, there are no real consequences. You are teaching her that it is perfectly acceptable to drive dangerously and put others at risk of injury or death because otherwise she might be inconvenienced. Is this TRULY in her best interest? Is it what you need to do to be a responsible parent? what will you say to the other parties when she wrecks the next car (she will) and someone is seriously hurt or worse?
Please don't cosign or tolerate your husband cosigning. Please, if she must have a car, let her buy it herself with money she gets from her own hard work. You won't just keep other people safe. You will keep HER safe. After all, she could kill herself with her driving too. Please insist that if she lives in your home and buys a vehicle, that she MUST take a safe driving course before she drives again. Even if she buys a vehicle, tell her she cannot bring it onto your property unless/until she takes and passes a safe driving course and pays her own insurance and other car related expenses.
Lives depend on this, including her own. Maybe if your husband hears it this way he will 'get it' . At the very least, insist she pay half the car cost up front. The time it takes to save up will give her some time to mature, and it will give her time to take the driving course. She isn't a kid anymore, but she still NEEDS you and husband to parent her.