I would say if she is a good mom, and she isn't on drugs, drunk, abusing her children, then they are good to have more kids. now...if it was 20, or a third world country where literally one could starve..I would feel different. but, you can have all the money in the world, then lose your job, or someone dies, or you become ill or disabled....are we ever really that stable? No, I don't think so. I am lucky that my husband and I have very good careers and make a very good income and our three children have enriching lives with good neighbourhood, and sports and clubs. If we lost it all...would that make me a mom not fit to have my kids? I just really hate judgements based on income. I really do. There is such good parents out there with less (and shitty ones with more)....and even though my husband and I do make a good income, we have had times when we REALLY struggled financially.
There is a huge difference between being stable and losing your job, dealing with major illness etc. while you already have children vs. not having enough and making the conscious decision to have more children. I would also argue that if someone gets to a point where they lose everything and they are living in poverty with 2 children already they definitely should not have any more children since dealing with the ones they have is already as struggle and as far as should they have their children taken away from them... that really depends on how bad the circumstances are. Not doing drugs, not beating your children and loving your children sometimes isn't enough if you can't afford to feed and clothe your children properly. Sometimes, depending on the circumstances, temporary interventions may be needed and may be in the best interest of the child until the parents can get back on their feet.
I am not advocating that all children need to be taken away from their parents should they fall upon hard times but, for example, I know a situation where there is a family that is practically starving. It's a single mother with 2 children, the mother works insane hours, one of the children suffers from autism, she made several bad investments including buying a large piece of land with horses because her daughter loved horses.
These are expensive horses that she is struggling to sell, she is receiving government benefits to the extent allowed, all the money she makes from work (she owns a small shop) goes to paying the basic bills and trying to maintain the land so she can attempt to sell it. The children struggle in school because they spend so much time working on this dilapidated farm dealing with repairs or horses that it interferes with their studying while she is at work all day and they pretty much live on ramen and white bread with a slice of ham when they can afford it. They have almost no clothing, the clothing they do have has holes in it, they do not a washing machine or any laundromats nearby to do laundry so they are wearing the same thing day in day out, all their shoes have holes in them which makes things tougher when working outside in the mud all day with animals.
These children practically start crying when they see other people eating because they are so hungry but she can't afford more food, their diet is anything but nutritious, her shop is bringing in almost no work and she is on the verge of being completely homeless so she is trying to do everything she can to keep her investment alive.
I have seen how she lives, I have given the children food and clothing before just so they don't go through winter walking in the snow with holes in their shoes. I think their situation is borderline where they may be better off with someone else for a while until she can adequately feed and clothe her children and I CERTAINLY do not believe she should have any more children in this environment because I think that would be gross negligence.