I guess the answer to the question "is intelligence inherited through the mother?" is not only a yes/no one, but also by "how much?".
Very often, scientific research results are presented as yes/no ones, but in fact, the interesting part is in the metric.
For example, it could be true that moms are "more important" for the intelligence of their children, but marginally so. This is more or less similar to the idea that "old women" have "worse" children: maybe the probability of having children with problems increases with the mom's age, but it continues remaining true that the most likely scenario is that the child of an old mom will be perfectly healthy. But instead, moms are terrified by that, and they take radical decisions based on that information, because they *believe* that the most likely scenario is the child will be "defective".
For example, an old result quotes the intelligence correlation between mom and child is 0.55 and between dad and child is 0.51.
http://webspace.ship.edu/cgboer/intelligence.html
So, according to this result, it is true that mom is more important than dad, for the child intelligence.
But:
1. A correlation of 0.55 is low. If one scatters-plot two variables correlated with a correlation coefficient of 0.55, the signal is almost imperceptible, and what dominates is noise
2. The difference between 0.55 and 0.51 may be measurable over a big sample, but on a single case, the measure is irrelevant
I am assuming these correlations were measured using IQ test results, and no genetic analysis was performed.
So, the answer to the question may be technically yes, but in practice for a couple, the result is irrelevant. Love your child, educate him/her, and not be worried about all this research (or supposed research).