Hi KayBug,
I drew a horary for the time I read your question, and the answer to the chart is that she will almost certainly come home. You, Venus, are combust - this leads me to believe that you are blind to something about your daughter, or are not seeing some part of her predicament. Being combust may also indicate your worry for her. Your significator and hers are both in Aquarius - perhaps indicating estrangement - but with the potential to become friends. This will involve some conflict, but there is definately potential for it to be worked out. Make sure to hear her story and her feelings, and beware of blind spots or lies - she may lie to you, or has lied to you, about things you do not yet know about. Likely this was not to specifically deceive you, but more out of defensiveness and fear of judgement or concern for 'what you would think'.
Your daughter, the Sun, is severely debilitated and peregrine - she is wandering in the wilderness of her own making, disconnected and aimless. She is ruled by Saturn - the baby and the partner - and obsessed with someone's esteem - possibly yours. She is not very content with herself, either, as the Sun is in its own detriment.
You, Venus, are in a much stronger position - you also are ruled by Saturn, but in mutual reception with it: I am assuming this is the baby, instead of the partner. I don't think you're too sure about your daughter (Sun in its detriment again), perhaps even disliking her, though not hate or loathing. Mistrust, maybe?
That she is pregnant is clearly indicated - the significator of the baby is Saturn in Libra in her turned 1st House, the house of her body, a classic indicator of pregnancy. Being Saturn, the baby is percieved as a burden. However, Saturn is exalted - it is also trine her significator, the Sun. I feel that she may come around and accept the child in time, especially if you encourage and support her in the pregnancy. With the trine present, the child may actually be very good for her, provided it (probably male) has a stable home.
The horary certainly indicates this is not an ideal solution, without any easy fix, but the potential is there for you and her to work together. Do be wary of those blind spots and gaps in your information, however.
Looking at her natal chart, she is a stubborn girl, prone to personal drama and exaggeration of her dramas, honestly quite good hearted, I think, but with a deep fear and loathing of herself. She mistrusts herself, and is perhaps paranoid that others mistrust her. She is probably not very intellectual, acting on emotions and subjectivity and this would form a sort of skewed practicality which leads in the wrong directions. With Scorpio on the 12H and 1H cusp, she is running away from the darker parts of herself, fears herself, and as a result, consistantly projects this fear into the world. With those squares to Neptune, deeply impressionable, probably quite fantasical in many ways, and easily wooed with illusions of perfection and romance.
The key to your daughter's chart is Mars opp Saturn and Uranus. Mars is her ruling planet, and those two oppositions will inform the root of her problems. The sextiles to the Moon and Jupiter/Venus are the keys to helping her overcome them. Sun and Mercury opp Pluto are also important. I'd suggest reading those interpretations in-depth somewhere, and seeing how they apply in her life.
Also, I would add that I disagree with Rahu: I don't think they will marry, but it may take a while for her to emotionally seperate from this man. Expect a long haul. Without knowing the depths of the situation, I would encourage you to make use of your judgement, but be honest, fair, and perhaps to involve a Libran sort of authority - a psychologist, perhaps?
Hope that helps!