Tubing one is way more than poking a hose down one, if the hose is too stiff you can puncture something, and it needs to bend around in the belly to get to the air, or you can get it in the lungs. I might guess she is full of oats, and maybe just over full. Start with a little mineral oil, it will usually get things flowing. You have two kinds of bloat, gas or foam, foam usually is from something in the feed like alfalfa or a batch of feed that might have something in it like the mixer at the mill had some hog feed in it. Gas is from not being able to belch, and stomach just not doing well.
If you do tube one, get a bloat hose from the vet supply, the ends are smooth, it has a hole on the side to make it work better. In a last case instance, keep a 16 ga by 3 needle somewhere, about 30 degrees down and to the front of the hooks, about 6 inches stab her 1 time, hold down firm on needle, the belly will push it around, it will save one in an emergency .