Improvise. There is a lot of usable material available in a forest, the most basic of which is foliage . There is a precedent for this:
So he made them fall, through deception. And when they tasted of the
tree, their private parts became apparent to them, and they began to
fasten together over themselves from the leaves of paradise.
Basically a Muslim is not allowed to live under non-Muslim leadership unless he has some reasons to do so (among these valid reasons you may find: work, trade, studies).
Secondly there's no harm (for a Muslim) in following the rules made by a non-Muslim government if they don't ask him to do something haram. Else a Muslim must consider leaving this country ...
As we take a look on the bases of islam. Islam not allowing a woman to discover her head in so places there is an irshad "the woman who never covers their heads are the wife of iblees(shitan)."
The thing you said ablution is not performed while women head is uncovered...?
So how can we perform ablution with uncovered head?
Although your ablution is ...
In https://islamweb.net/en/fatwa/89914/ it says:
It is not an obligation on a woman to cover her head while performing
ablution except if she is in the presence of marriageable men.
If the lady can be seen by non-mehrams while performing ablution then she needs to cover her head. Otherwise it is not necessary to cover her head since ablution itself is ...
We may read in the sunnah:
Anas b. Malik reported:
Umm Sulaim who was the grandmother of Ishaq came to the Messenger of Allah (ﷺ) in the presence of 'A'isha and said to him: Messenger of Allah, in case or woman sees what a man sees in dream and she experiences in dream what a man experiences (i. e. experiences orgasm)? Upon this 'A'isha remarked: O Umm ...
The prophet () told us to
... pray as you've seen me praying … (Sahih al-Bukhari)
This should apply to both men and women. So there's basically no difference in the manner we pray.
Nevertheless some scholars recommended that ladies should pray in a more compact manner (having their body parts:arms and legs closer to the body) to avoid showing men details ...
There's no such thing as a minimum amount of spotting. Once menses is recognized by its attributes it is menses no matter how few it is and all related rulings apply.
And menses only ends when there's no trace of it. And one can go on with his worship after taking ghusl.