If they sleep together, they should be find in a bonding pouch together. In any even you would be directly able to observe their behavior and intervene if necessary. Most bonding pouches will hold two sleeping gliders. Do get a larger bonding pouch if yours is really too small for two gliders to sleep comfortably.
If she is in heat, they should calm down in a couple days - but may have issues again each month when she is again in heat.
Be sure your 3 dishes are are in different locations in the cage - high, low or on opposite sides - not close enough for one glider to chase the other from two dishes at one time.
Another thought - if it is food related, put the same foods in each dish.
I only serve mixed vegetables once a week. I do have one glider that believes "Corn - all mine" and she will chase the others away from the dinner plate until she has hogged all the corn she wants. Sometimes is may be one food that a glider wants all to his/her self. If that seems to be the case, skip that food for several nights to see, or make sure some of it is in every dish.