Possibly - it's amazing what a pair can produce in a litter - you can have 2 short haired cats that produce all long haired kittens or a combination of long and short hair. It's fairly easy if you know the backgrounds of parents what they are capable of producing in a litter.

Some cats have 'poor hygiene' when it comes to grooming their hind ends. I work with long haired cats and some of them HAVE to be trimmed on the hind end at least once a month to keep them 'stool free'. Unfortunately, there's not a lot you can do to get her to clean up after herself, which is why keeping their hind ends shaved makes life a lot easier. If she has even the slightest trace of loose stool, this will contribute to the mess, so trying to get that cleared up can go a long ways toward hygiene improvement. They do make a 'cat wipe' that you can use (similar to baby wipes for infants) to clean her bottom off when needed. If you keep her trimmed on the rear end, this should be fairly easy to keep up with. Also, have your vet check to see if she has impacted anal glands, They can make the area a little messy if they are draining at all.

Please let me know if I can help further.