I wouldn't be concerned, I'd be proud that she held it that long. I also wouldn't encourage using the crate as a place to go potty. It's in a dog's nature not to potty where they sleep, and you want the crate to be thought of as a safe place, a 'den' as it were. If you encourage use of the crate as a place to go it might make it hard to break her of the habit later, and might make it much tougher to potty train her in general.
If you are going to be leaving a puppy that young alone for that many hours on a regular basis, I'd try to work something out with a friend or neighbor to come and take the pup out to go potty sometime around midway through your time away at least until she is a bit older. If she can hold it consistently for that long, and some pups can but not most, then perhaps you will be ok. The general rule though is one hour per month of age is about as long as you should expect a puppy to be able to hold it.