She can take a break. It doesn't say anywhere that it is haram for her to take a break for more than two years. I don't know people try to make the deen hard for them.
Shaykh Ibn Baaz (may Allah have mercy on him) quoted this hadith as evidence for it being permissible to space having children in order to give them a proper Islamic upbringing, when he said:
If a woman has a lot of children, and it is difficult for her to give them a proper Islamic upbringing because they are so many, then there is nothing wrong with her taking something to space her pregnancies in order to achieve this important purpose, so that pregnancy will not adversely affect her or her children, as Allah has permitted ‘azl for this and similar purposes.
Early Muslims might not have had access to contraceptives that we had, but they used to use other methods, so contraceptives ect is completely fine and nothing says that more than 2 yrs is wrong.