It's kooky and not proven.
I'm glad your daughter's healthy now; but chances are the two things are unrelated. Most kids have some kind of issue--though not so dramatic as your daughter's, usually. I was born with congenital hip dysplasia, developed scoliosis, and had a febrile seizure as an infant. My sister, who is not autistic, had a life-threatening asthma attack as a toddler and can't digest red meat. And my littlest sister, who is probably autistic like me, had an absolutely normal childhood with no health problems and no vaccinations.
The problem here is that your daughter is a sample size of just one. You can't prove anything with a single case. One in a hundred babies with bowel perforations will be autistic, just like one in a hundred babies without will be. Digestive diseases are among the most common for children. So you could find many, many, many autistic children with digestive problems and it still wouldn't prove anything. You'd have to find that there were more such autistic children than non-autistic, and that the increased risk is greater than it is for children with developmental disabilities in general. And when you do those statistics, there's no link.
Not to say that autistic kids shouldn't have digestive problems addressed and solved, if possible. Autism makes it much harder for you to cope with sensory input, and your own body can overload you if you're sick.
