She married him when she was barely 16, right? :-?
I think her parents where seperated then, but why did her father allow her to marry this man with a quite (!) bad reputation?
Apparently both Philipp & Louise agreed to the match but this was not the case of everyone in the family. Dora's grandmother Queen Marie-Henriette of Belgium wrote to her daughter Stéphanie : "About Dora'sw wedding - a mere child to a man old enough to be her father, protestant, fanatic - I would rather not say a word".
Louise was in the middle of her love affair with Mattachich when Dora & Günther became engaged. Philipp Coburg feared that his wife's influence on their daughter might be bad &, together with his prospective son-in-law, imagined a stratagem to take Dora away from her. Mother & daughter were at the time staying in Nice. Günther asked Louise leave to go with Dora to Dresden to meet his mother, giving his word that Dora would be brought back to her later - which she was not.
Louise did not really care about her children when they were small but seems to have become more & more attached to Dora as she grew up. Her daughter's desertion was very painful to her.