Hi Dream,
There actually seem to be a couple of things, which could've been better in the chart. I might not be able to give you a straightforward answer, but I will point out the aspects etc. that hit me, looking at the chart, nonetheless. Please this is just a horary attempt, and doesn't have to be right.
Mars in Libra, signifying your friend, in detriment, as you observed
Mars' placement in your sixth also bodes worry/cause to worry.
Moon, in dignity in Cancer, but squaring Mars.
Looking at you, Moon squaring planets in your sixth house (malefic house of sickness) points at your worries- which are related to Mars- your friend (placed there).
Notice also that the Moon opposes Jupiter (though by 7°), and Jup rules your house of friendships again signifying your worries having to do with friendships/friends - and perhaps also validating the motive of the question, even the question itself. (Though this does not answer the Q, whether or not the friend is ill, but endorses your suspicion in a way, IMO). Similarly perhaps, Jup's placement in your eight (as the querent) is also not auspicious.
Moon also squares Mer, which rules your friends eight- implies worries your friend might have.., as eight again is a malefic house.
Moon's location in the friends ninth, along with its difficult aspects, might hint at the fact that the foreign land didn't suit him/her well. Maybe it's all just stress related.
The 'detrimented' Mars also rules your friend's sixth (health), and is placed in his/her twelfth.
Mars and Venus placed so closely in the chart hint at the closeness between the two of you.
Looking at Saturn in your friends eleventh (esp as it rules his/her third) shows hindrance in/ loss of communication with friends. Now, you don't consider the outers in horary (and Ura is not angular here either), but look at how aptly, otherwise, the house placement of Sat (in friend's 11th) in opposition to Ura (in your eleventh) might endorse the aforementioned- sudden break of communication/contact.
Well, I hope somebody else might be able to show some glimmer of light. Do give us some feedback when you hear from your friend.
Best
aquarius7000