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Proper care and pruning will keep your vine happy and full.

A healthy plant is known to bloom year round in sunny Florida.

Make sure the plant has a good support trellis and is protected from winds.

Here is a link with care information.

https://www.gardeningknowhow.com/ornamental/vines/mandevilla/mandevilla-plant.htm

Did you leave the bulbs in the pots? This would be the most ideal situation.
Just move the pots into a dark location at temperatures that remain at a constant 40 to 50 degrees.
Keep the soil barely moist.

If you have dug up the bulbs you can also store the bulbs. This is a little bit more difficult and may not have as much success.
Wrap the bulbs in slightly moistened newspaper and put in a dark plastic bag. Store in a cool dark location with constant temps that are between 40 to 50 degrees.
Check the bulbs monthly to make sure they are not drying out, mist the newspaper if needed.
When spring arrives bring out your plants and bulbs.

https://www.gardeningknowhow.com/ornamental/vines/mandevilla/mandevilla-plant.htm

Yes, you can give your Mandevilla a start before the weather warms enough to bring outdoors.
Bring it into a bright location and wait for it to break dormancy. Do not introduce to much heat, make the transition gradual.
When you began to see new growth you can began to resume normal watering.

Here is a link with more information.

https://www.gardeningknowhow.com/ornamental/vines/mandevilla/winterizing-mandevillas.htm

You an purchase lights that are specific for plant growth.
You an also purchase 'full spectrum' lights that will provide good light for your plants.
Here are some links with more information.

https://www.gardeningknowhow.com/houseplants/hpgen/fluorescent-lighting-for-indoor-gardening.htm
https://www.gardeningknowhow.com/houseplants/hpgen/what-are-grow-lights.htm
https://www.gardeningknowhow.com/plant-problems/environmental/how-light-affects-the-growth-of-a-plant-problems-with-too-little-light.htm

This may be just a naturally occurring event, instead of something sinister.
Bee's live really only a short period. Queens are the longest living bees.
They may have lived out there lifespan and simply died.

Keep an eye out for any other signs of unusual Bee die off.
You can report large numbers to your local County Extension Office.

https://www.gardeningknowhow.com/plant-problems/pests/pesticides/what-are-neonicotinoids.htm

Are you sure your mandevilla is completely dead? Have you tried doing a scratch test on a small section of outer bark to see if there is any green in the underlying tissue? If you have and there was no green, I would then cut the stems 6 inches above the ground and take a "wait and see" approach. If the root system survived the cold weather (hopefully it did), in time you may see new growth.