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I would water daily, especially for the first two weeks of a new planting.
Soil should be moist, never dry or never soggy.
Pull the rock back so you can check the soil moisture.
Hardwood mulch application of 2 to 3 inches in depth will help with moisture retention.
Dropping means the plant is stressed and may be under watered, but if the soil is not draining the plant can also be droopy from lack of oxygen.
It's not to late, but do a bit of investigating and correct the issues.

https://www.gardeningknowhow.com/ornamental/shrubs/indian-hawthorn/growing-indian-hawthorn.htm

Deer do find the Indian Hawthorne a tasty meal year round.

Once the Hawthorne is gone, they will move on to less tasty plants.

Here is a link with some deer resistant plant suggestions.

https://www.gardeningknowhow.com/plant-problems/pests/deer/deer-resistant-plants.htm

Late winter or early spring while the shrubs are still dormant is best.
This fall you can root prune the shrubs to get them ready for the transplant.
If you are transplanting a hawthorn from somewhere else in your garden, root prune it about three months before transplanting. To root prune, press a sharp hoe blade into the soil repeatedly to cut a circle 8 inches deep into the ground around the growing tree. The circle should have a diameter of at least 24 inches, more if the tree trunk's diameter is more than 1 inch. This will cut off the long roots that cannot travel with the bush to its new location and encourage the formation of shorter roots.

https://www.gardeningknowhow.com/ornamental/shrubs/indian-hawthorn/growing-indian-hawthorn.htm

The best time for pruning is immediately after flowering and before new buds start forming. This article will walk you through how:

https://www.gardeningknowhow.com/ornamental/shrubs/indian-hawthorn/indian-hawthorn-pruning.htm

It's a hardy plant, so you can transplant it any time when the temperatures will be steady and not extreme (give it plenty of water until it re-establishes) -- early fall or late spring should be fine, try not to transplant it in the midst of severe summer heat. This article will give you additional tips on caring for your Indian Hawthorne: https://www.gardeningknowhow.com/ornamental/shrubs/indian-hawthorn/growing-indian-hawthorn.htm

Indian Hawthorn should be pruned soon after flowering. This article should help
http://www.gardeningknowhow.com/ornamental/shrubs/indian-hawthorn/indian-hawthorn-pruning.htm

Although Indian hawthorn can survive severe pruning, I do not recommend cutting the entire plant to the ground. You can replace the plant entirely, or you may wish to cut the plant back to 6 or 8 inches, wait for new growth to appear, and then eventually remove the rest of the diseased branches.

Here are a couple of articles you might find helpful:

https://www.gardeningknowhow.com/ornamental/shrubs/indian-hawthorn/indian-hawthorn-pruning.htm

https://www.gardeningknowhow.com/plant-problems/disease/plant-leaf-spots.htm