Ummm, the current administration is trying to build a wall to discourage them from making the attempt to cross the border illegally in the first place. Not to mention prevent the parents endangering their own children's lives in the attempt to cross the desert. Meanwhile, AOC and her ilk are /incentivizing/ those people to make that dangerous crossing, trying to inflate the crisis precisely to get Trump out of office. His policies are the exact policies "liberals" had 10 years ago, so the "outrage" against them now is utterly hypocritical.
And I hate having to spell out something so simple that a child could get it, but AOC (among others) is blocking funding that would be earmarked for things like beds (so the children don't have to sleep on the floor), hygiene implements, actual dorm rooms rather than fenced in areas with no privacy, etc.
In any case, none of this is in any way relevant to the meme, which is simply about highlighting how fake AOC is with this staged photo-op intended to make her look good.