Until she is at least 6 months of age, she needs to be fed 3 times a day. Also, do NOT elevate her food bowl. There are now two studies out that have shown that elevated food bowls INCREASE the chances of bloating or of torsion (2 different things). Purdue did one study and at the moment (I am tired, sorry), I can't remember who the other study was through.
No one really knows what causes bloat and torsion, but there does seem to be a tendancy in some lines to produce bloaters. Stress is also a big factor in bloat and torsion, but by no means are "all" danes prone to bloating and torsion.
To get your dog to slow down while eating, you can do several things. Hand feeding to slow down works well, but is time consuming for the owner. The BEST way to slow down a fast eater is to buy a large shallow pan (not a smaller deep dish) and put a handful of food in it. The dog has to work to get each kibble as they will slide around the pan as the dog eats. It can't just vacuum everything up from a small pan where the kibble is all packed together. Continue dolling out food a handful at a time until the portion for that meal is consumed.
Give her 15 minutes. If she refuses to eat, pick the food up, and wait till the next feeding. Obviously if this goes on for more than one day for a small puppy there is something else going on and a visit to the vet is in order to rule out any medical issues.
If you are only feeding 2x's a day right now that may be why she is eating too quickly. She's getting too hungry between meals.Bump her up to at least 3 meals a day.
Caroline Smith
FarView Great Danes