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Even if she is a Muslim and that is a religious hijab; and not a cultural covering, hijab is a symbol of modesty. There is much debate as to what modesty is or what it requires a woman to cover to dress hijab. Some argue modesty is defined by the surrounding culture and the times. Some alternate covered or not. Most Christian faiths ask you to dress modestly as well, and looking at modest dress in the last few centuries versus what is allowed now you will see big differences. Is it an insult to Christians for women to wear a skirt or pants? Not all muslims are fundamentalists just like not all Americans are Amish or not all Christians practice as was done hundreds of years ago. In Judaism the question of being able to use a fan or lightbulb on Shabbat didn't exist then but it's debated today, while some don't even observe the sabbath as most Christians don't either. Change is a process. It could also be a political statement. Either way it's her choice, and not for us to judge.

The average funeral is over $6,000. Using the average deaths per day, and the average burial plot size, if everyone who died every day got a burial that's 13811.77 sq miles of cemetery. Or a little over 1/3 the total size of Maine, A DAY.
Take that number and your population density and see how many people are displaced by an area that size. So even if we don't make it an environmental issue it's a practical issue. Wasting possible living space to have a place to keep dead bodies that does nothing else. Memorials are nice, but how many years before no one comes? Ever seen an old cemetery? Often unreadable graves to people long forgotten. So even if people don't "move on" they die too. Due to cost many people get cremated anyway. I'd rather have a practical memorial than a useless one even if you disregard the environment, it makes sense to not waste what the living need on the dead, and if the dead can give back to the living without desecration even better.